Spherical Lenses

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Spherical Lenses

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Part A. Study the diagram given below and answer the questions

1. Which phenomenon is responsible for the bending of light in above diagram? *

1 point

Reflection of light

Refraction of light

Dispersion of light

Scattering of light

2. Identify the device X *

1 point

Concave mirror

Concave lens

Convex lens

Convex mirror

3. What is point 'A' callled? *

1 point

Pole

Focus

Centre of curvature

Aperture

4. Name the physical quantity which represent the reciprocal of the distance between the device X and point A. *

1 point

Focal length

power of a lens

Radius of curvature

A ray

5. What is the SI unit of the quantity named in Q4 above? *

1 point

metre

centimeter

Dioptre

Joule

6. What kind of image is obtained at point A? *

1 point

Real image

Virtual image

Both real and virtual

No image is obtained at point A

7. The third ray from the top does not show any bending. It is because *

1 point

The angle of incidence is 90 degree

The incident ray falls normally on the lens

the ray is a super ray. No medium can bend it

The angle of incidence is 45 degree

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