abhisheksir vedant u
TRANSCRIPT
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abhisheksir_vedantu
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Bridge course1
Chapter Outline2
Regular Umang Sessions3
One shot4
Menti Quiz and doubt solving5
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LIGHT IN ONE SHOT
Reflection Refraction
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LIGHT IN ONE SHOT
Reflection Refraction
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Q6: A concave lens of focal length 15 cmforms an image 10 cm from the lens. How faris the object placed from the lens?
Answer: -30 cm
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REFLECTION
Laws of reflection
Types of mirrors
Plane mirrors
Spherical mirrors
Concave
ConvexMark Weightage- 1 Mark
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Reflective surface
Curved inward Curved outward
Concave Mirror Convex Mirror
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Spherical mirrors
Parts Image formation
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This heart belongs to Harsh Sir
But my heart belongs to her!
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Parts of Spherical mirrors
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Parts of Spherical mirrors
● Centre of curvature C● Radius of curvature R● Aperture● Pole● Principal axis
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Q1: A mirror with a surface that curvesinward like the inside of a bowl
Concave mirror Convex mirror
Plane mirror Flat mirror
A B
C D
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Q1: A mirror with a surface that curvesinward like the inside of a bowl
Concave mirror Convex mirror
Plane mirror Flat mirror
A B
C D
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Reflection in Spherical mirrors
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Reflection in concave mirrors
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Reflection in concave mirrors
All the rays parallel to the principal axis pass through the same point after reflection
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FOCUS of concave mirrors
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Reflection in convex mirrors
All the rays parallel to the principal axis pass through the same point after reflection
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FOCUS of convex mirror
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Focal length = ½ radius of curvature
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Standard incident rays of concave mirror
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Mr. Focus Mrs. Focus Mr. Focus + Mrs. Focus
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Standard incident rays of convex mirror
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Q2: An incident ray that is parallel to theprincipal axis in a concave mirror
will reflect parallel to the principal axis
will refract through the focal point
will reflect through the center of
curvature
will pass through focus after reflection
A B
C D
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Q2: An incident ray that is parallel to theprincipal axis in a concave mirror
will reflect parallel to the principal axis
will refract through the focal point
will reflect through the center of
curvature
will pass through focus after
reflection
A B
C D
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Ray Diagram of Concave mirrors
1. Object at infinity (∞)
2. Object behind C(Between C & ∞)
3. Object on C
4. Object between C and F
5. Object at F
6. Object between P and F
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Ray Diagram of Concave mirrors
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Ray Diagram of Concave mirrors
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Ray Diagram of Concave mirrors
Object Position Image Position Image properties
Size Orientation Nature
1 At ∞ At F Diminished Inverted Real
2 Between C & ∞ Between C & F Diminished Inverted Real
3 At C At C Same size Inverted Real
4 Between C & F Bet C & ∞ Enlarged Inverted Real
5 At F At ∞ Enlarged Inverted Real
6 Between F & P Behind P Enlarged Erect Virtual
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Ray Diagram of Convex mirrors
1. Object at infinity (∞)
2. Object in front of the mirror
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Ray Diagram of Convex mirrors
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Ray Diagram of Convex mirrors
Object Position Image Position Image properties
Size Orientation Nature
1 At ∞ At F Diminished Erect Virtual
2 In front of mirror
Between P & F Diminished Erect Virtual
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Q3: A student studies that a convex mirroralways forms a virtual image irrespective ofits position. What causes the convex mirrorto always form a virtual image?
because the reflected ray never
intersects
because the reflected ray converges at a single
point
because the incident ray traces its path back along
the principal axis
because the incident ray of a convex mirror gets
absorbed in the mirror
A B
C D
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Q3: A student studies that a convex mirroralways forms a virtual image irrespective ofits position. What causes the convex mirrorto always form a virtual image?
because the reflected ray never
intersects
because the reflected ray converges at a single
point
because the incident ray traces its path back along
the principal axis
because the incident ray of a convex mirror gets
absorbed in the mirror
A B
C D
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Q4: Where would the reflected rays meetfor the image formation to take place?
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Q4: Where would the reflected rays meetfor the image formation to take place?
Behind the mirror Between F and O
Between C and F Beyond C
A B
C D
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Q4: Where would the reflected rays meetfor the image formation to take place?
Behind the mirror Between F and O
Between C and F Beyond C
A B
C D
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Sign Convention of mirrors
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Concave mirrors
Distance Sign
f -ve
R -ve
u -ve
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Convex mirrors
Distance Sign
f +ve
R +ve
u -ve
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Mirror Formula
u - Distance of the imagev - Distance of the objectf - Focal length of the mirror
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Q5: A student conducts an activity using aconcave mirror with focal length of 10 cm.He placed the object 15 cm from themirror. Where is the image likely to form?
At 6 cm behind the mirror
At 6 cm in front of the mirror
At 30 cm behind the mirror
At 30 cm in front of the mirror
A B
C D
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Q5: A student conducts an activity using aconcave mirror with focal length of 10 cm.He placed the object 15 cm from themirror. Where is the image likely to form?
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SOLUTION
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Q5: A student conducts an activity using aconcave mirror with focal length of 10 cm.He placed the object 15 cm from themirror. Where is the image likely to form?
At 6 cm behind the mirror
At 6 cm in front of the mirror
At 30 cm behind the mirror
At 30 cm in front of the mirror
A B
C D
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Magnification
Magnification is the ratio of heightof the image to the height of theobject
Hi → Height of the image
Ho → Height of the object
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Magnification
If object distance (do) & image distance (di) is given
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Image size is same as object size if m=1
Image size is larger than the object size if m>1 : Magnified image
Image size is smaller than the object size if m<1 : Diminished image
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Q6: A student conducts an activity using aflask of height 15 cm and a concave mirror.He finds that the image formed is 45 cm inheight. What is the magnification of theimage?
-3 times 3 times
⅓ times -⅓ times
A B
C D
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Q6: A student conducts an activity using aflask of height 15 cm and a concave mirror.He finds that the image formed is 45 cm inheight. What is the magnification of theimage?
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-3 times 3 times
⅓ times -⅓ times
A B
C D
-3 times
3 times
A
B
⅓ times
-⅓ times
C
D
Q6: A student conducts an activity usinga flask of height 15 cm and a concavemirror. He finds that the image formed is45 cm in height. What is the magnificationof the image?