Refraction at Curved Surfaces

Q. A telescope with objective of focal length 60 cm and eye piece of focal length 5 cm is focused on a far distance object such that the parallel rays emerge from eye piece . If object subtends an angle 2^°on objective, then angular width of the image is

Q. An equiconvex lens is made from glass of refractive index 1.5. If the radius of each surface is changed from 5 cm to 6 cm, then the power- (a) decreased by 3.33D. (b) increase by 3.33 D

Q. A thin lens of focal length +12cm and refractive index 1.5 is immersed in water (refractive index =1.33).What is its new focal length

Q. If a thin lens is dipped in water, does its focal length change?

Q. a conversing lens made of a material of refractive index 1.53 has a focal length f equal to 16 cm in air. if the lens is immersed in a liquid of refractive index 1.33 then what will be its new focal length f in the liquid?

Q. Hema viewed a certain object and found that it is not clearly visible to her. It was found that the image was formed by his eye lens $3cm$ away from the pupil of his eye.
Hema can correct this defect in her vision by using:

1. Concave lens
2. Bifocal lens
3. Convex lens
4. Plano-convex lens

Q. In which of the following cases a light ray suffers the maximum deviation while passing through pole?

1. 
2. 
3. 
4. 

Q. Refraction of light occurs due to change in the speed of light in different media.

1. True
2. False

Q.

Which of the following factors is responsible for the refraction of light?

1. optical density

2. frequency of light

3. angle of incidence

4. mass density

Q. Refraction of light occurs due to change in the speed of light in different media.

1. False
2. True

Q. In which of the following cases a light ray suffers the maximum deviation while passing through pole?

1. 
2. 
3. 
4.