Worksheets10th Light
Total questions: 15
Worksheet time: 43mins
The radius of curvature of a convex lens is 20cm. What is its focal length?
10 cm
20 cm
30 cm
40 cm
Name the type of mirrors used in the following situations:
(i) Used by Dentist.
(ii) Rear-view mirror of vehicle
(i) Diverging mirror
(ii) Converging mirror
(i) & (ii) Both Converging mirror
(i) Converging mirror
(ii) Diverging mirror
(i) & (ii) Both Diverging mirror.
In the given ray diagram, which of the following path of the refracted ray is correct?
An object is kept at a distance of 4m in front of a spherical mirror, which forms its erect image at a distance of 1m
from the mirror. What is the magnification? Is the mirror concave or convex?
m = +4
Concave Mirror
m = -4
Convex mirror
m = - 1/4
Convex Mirror
m = +1/4
Convex Mirror
A concave mirror produces a three times magnified image on a screen. If the object is placed 20cm in front of the mirror, What is the image distance?
-20 cm
-40cm
-60 cm
-10 cm
Calculate the power of a lens whose focal length is +40 cm. Also Identify the nature of the lens.
P = +0.25 D
Concave lens.
P = +2.5 D
Convex lens
P = +0.25 D
Concave lens
P = +2.5 D
Convex Lens
Complete the path of the refracted ray of the given incident light on the given convex lens.
The image of a candle flame placed at a distance of 30cm from a mirror is formed on a screen placed in front of the mirror at a distance of 60cm from its pole. What is the nature of the mirror? Find its focal length.
F = - 20 cm
Concave Mirror
Real & Inverted Image
F = + 20 cm
Concave Mirror
Virtual & Erect Image
F = - 20 cm
Convex Mirror
Real & Inverted Image
F = + 20 cm
Convex Mirror
Virtual & Erect Image
A child is standing in front of a magic mirror. She finds the image of her head bigger, the middle portion of her body of the same size and that of the legs smaller. The following is the order of combinations for the magic mirror from the top.
Plane, convex and concave
Convex, concave and plane
Concave, plane and convex
Convex, plane and concave
The refractive indices of glass and water with respect to air are 3/2 and 4/3 respectively. If the speed of light in glass is 2 x 108 m/s, find the speed of light in water.
0.5 x 108 m/s
3 x 108 m/s
2.25 x 108 m/s
2 x 108 m/s
A concave lens has focal length of 15 cm. At what distance should the object from the lens be placed so that it forms an image at 10 cm from the lens? Also, find the magnification.
u = + 30 cm
m = - 0.33
u = + 20 cm
m = - 1.33
u = - 20 cm
m = + 1.33
u = - 30 cm
m = + 0.33
A convex mirror used for rear view on an automobile has a radius of curvature of 3 m. If a bus is located at 5 m from this mirror. Find out the position, nature and size of the image.
v = - 1.15 m
m = - 0.23
Virtual & Erect
v = - 1.5 m
m = + 0.23
Real & Inverted
v = + 1.5 m
m = + 2.3
Real & Inverted
v = + 1.15 m
m = + 0.23
Virtual & Erect
An object is placed at a distance of 10 cm from a convex mirror of focal length 15 cm. Find the nature, size and position of the image formed.
v = - 6 cm
m = - 0.6
Real & Inverted
v = + 6 cm
m = + 0.6
Virtual and Erect
v = - 6 cm
m = - 0.6
Virtual and Erect
v = + 6 cm
m = + 0.6
Real & Inverted
Which of the following lenses would you prefer to use while reading small letters of newspaper?
A convex lens of focal length 50 cm.
A concave lens of focal length 5 cm.
A concave lens of focal length 50 cm.
A convex lens of focal length 5 cm.
An object 5 cm in size is placed at a distance of 20 cm in front of a convex mirror of radius of curvature 40 cm. Find out the position, size and nature of the image formed.
v = + 10 cm
h' = + 2.5 cm
Virtual, Erect and smaller in size.
v = - 20 cm
h' = - 0.5 cm
Real, Inverted and enlarge in size.
v = + 20 cm
h' = + 0.5 cm
Real, Inverted and enlarge in size.
v = - 10 cm
h' = - 2.5 cm
Virtual, Erect and smaller in size.
