Light Reflection and Refraction Test

Result

Light Reflection and Refraction Test - 23

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Weekly Quiz Competition

Question 1
1 / -0

Which of the following can make a parallel beam of light when light from a point source is incident on it?

A
Concave mirror as well as convex lens

B
Convex mirror as well as concave lens

C
Two plane mirrors placed at 90° to each other

D
Concave mirror as well as concave lens

Solution

When a point source of light is at the focus of a concave mirror or a convex lens, then emergent rays of light make a parallel beam of light. This is the reason; concave mirror is used as reflector of headlights.
Question 2
1 / -0

Which of the following statements is true?

A
A convex lens has 4 dioptre power having a focal length 0.25 m

B
A convex lens has –4 dioptre power having a focal length 0.25 m

C
A concave lens has 4 dioptre power having a focal length 0.25 m

D
A concave lens has –4 dioptre power having a focal length 0.25 m

Solution

The positive sign with the focal length indicates that it is a convex lens.
Question 3
1 / -0

Magnification produced by a rear view mirror fitted in vehicles

A
Is less than one

B
Is more than one

C
Is equal to one

D
Can be more than or less than one depending upon the position of the object in front of it

Solution

Convex mirror is used in rear view mirrors. Convex mirror always makes smaller images. Hence, magnification produced by rear view mirror is less than one.
Question 4
1 / -0

Rays from Sun converge at a point 15 cm in front of a concave mirror. Where should an object be placed so that size of its image is equal to the size of the object?

A
15 cm in front of the mirror

B
30 cm in front of the mirror

C
Between 15 cm and 30 cm in front of the mirror

D
More than 30 cm in front of the mirror

Solution

In this case, f = -15 cm and hence c = -30cm; because radius of curvature is double the focal length. When and object is placed on C, its image is of the same size, inverted and is formed on C.