WorksheetsLight, refraction and refraction
Total questions: 10
Worksheet time: 5mins
A concave lens of focal length 15 cm formed an image 10 cm from the lens, then the object placed from the lens is
+ 30 cm
– 30 cm
– 60 cm
+ 60 cm
A concave lens of focal length is 10 cm the distance between object and optical centre is 20 cm then the image distance is
– 7.00 cm
+ 6.67 cm
+ 7.00 cm
– 6.67 cm
If an object is placed 50 cm from convex lens, the image formed is equal to the size of the object, then the focal length of the lens is
+ 25 cm
– 25 cm
+ 50 cm
– 50 cm
The object and image distance of a lens are -30 centimetre and -10 cm respectively then the magnification of lens is
-3
– 0.33
+ 0.33
+3
The height of the object and image are + 2 cm and + 4 cm then the magnification of lens is
+2
+ 4
– 2
– 4
If the focal length of convex lens is + 50 cm then the power of this lens will be
– 2 D
+ 2 D
+ 0.02 D
– 0.02 D
Power of lenses -0.2 D it’s focal length and type of lens is
+ 0.25 m and convex lens
– 0.25 m and convex lens
– 5 m and concave lens
+ 5 m and concave lens
The refractive index of water is 1.33 then the speed of light in water is
3 X 10power of 8 ms-1
2.25 X 10 power of 8 ms-1
4.24 X 10 power of 8 ms-1
1.25 X 10 power of 8 ms-1
Observe given figure, the object distance is 30 cm then the image distance will be
60 cm
6 cm
15 cm
30 cm
Observe the given figure, find height of image ?
3 cm
6 cm
12 cm
18 cm
