TEST - 13 (X - REFRACTION OF LIGHT AT CURVED SURFACES)

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EFFORTS NEVER FAIL

NAME : *

1. Which one of the following materials cannot be used to make a lens? *

1 point

water

glass

plastic

clay

2. Which of the following is true? *

1 point

The distance of virtual image is always greater than the object distance for convex lens

The distance of virtual image is not greater than the object distance for convex lens

Convex lens always forms a real image

Convex lens always forms a virtual image

3. The value of the focal length of the lens is equal to the value of the image distance whenthe rays are, *

1 point

passing through the optic centre

parallel to the principal axis

passing throught he focus

in all the cases

4.The distance between focus and 'Optic centre' is *

1 point

Focal length

Principal axis

Radius of curvature

None

5.The rays which passes away from the principle axis is *

1 point

Paraxial rays

Marginal rays

Parallel rays

All

6.The focal length of a lens has in water. *

1 point

Decreased

Increased

Either increase/decrease

No change

7.On what factors does the focal length of a lens depends? *

1 point

Radius of curvature

Material

Surrounding medium

All above

8.The line that joins the center of curvature and the pole is called *

1 point

Focal length

Radius of curvature

Principal axis

None

9.The ray that travels along the principal axis is *

1 point

Deviated

un deviated

Passing parallel to Principal axis

None

10.The distance between the focal point and optic centre is called the *

1 point

Focal length

Radius of curvature

Principal axis

None

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