abhisheksir vedant u
60
abhisheksir_vedant u
Transcript of abhisheksir vedant u
abhisheksir_vedantu
Bridge course1
Chapter Outline2
Regular Umang Sessions3
One shot4
Menti Quiz and doubt solving5
LIGHT IN ONE SHOT
Reflection Refraction
LIGHT IN ONE SHOT
Reflection Refraction
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
REFLECTION
Laws of reflection
Types of mirrors
Plane mirrors
Spherical mirrors
Concave
ConvexMark Weightage- 1 Mark
Reflective surface
Curved inward Curved outward
Concave Mirror Convex Mirror
Spherical mirrors
Parts Image formation
This heart belongs to Harsh Sir
But my heart belongs to her!
Parts of Spherical mirrors
Parts of Spherical mirrors
● Centre of curvature C● Radius of curvature R● Aperture● Pole● Principal axis
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
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
Reflection in Spherical mirrors
Reflection in concave mirrors
Reflection in concave mirrors
All the rays parallel to the principal axis pass through the same point after reflection
FOCUS of concave mirrors
Reflection in convex mirrors
All the rays parallel to the principal axis pass through the same point after reflection
FOCUS of convex mirror
Focal length = ½ radius of curvature
Standard incident rays of concave mirror
Mr. Focus Mrs. Focus Mr. Focus + Mrs. Focus
Standard incident rays of convex mirror
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
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
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
Ray Diagram of Concave mirrors
Ray Diagram of Concave mirrors
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
Ray Diagram of Convex mirrors
1. Object at infinity (∞)
2. Object in front of the mirror
Ray Diagram of Convex mirrors
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
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
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
Q4: Where would the reflected rays meetfor the image formation to take place?
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
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
Sign Convention of mirrors
Concave mirrors
Distance Sign
f -ve
R -ve
u -ve
Convex mirrors
Distance Sign
f +ve
R +ve
u -ve
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
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?
SOLUTION
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
Magnification
Magnification is the ratio of heightof the image to the height of theobject
Hi → Height of the image
Ho → Height of the object
Magnification
If object distance (do) & image distance (di) is given
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
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
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
-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?
