TEST 2 LIGHT

The laws of reflection hold true for

• Plane mirrors only
• Convex mirrors only
• Concave mirrors only
• All reflecting surfaces

When an object is kept within the focus of a concave mirror, an enlarged image is formed behind the mirror. This image is

• real
• inverted
• virtual and inverted
• virtual and erect

If the image formed by a spherical mirror for all positions of the object placed in front of it is always erect and diminished , what type of mirror is it?

• concave
• Convex mirrors only
• plane
• All of the above

Name the type of mirrors used in the design of solar furnaces

• concave
• Convex mirrors only
• plane
• All of the above

A concave mirror has a focal length of 20 cm. At what distance from the mirror should a 4 cm tall object be placed so that it forms an image at a distance of 30 cm from the mirror? 

• 60
• -60
• 30
• -30

The image of a candle flame placed at a distance of 30 cm from a mirror is formed on a screen placed in front of the mirror at a distance of 60 cm from its pole. If the height of the flame is 2.4 cm, find the height of its image

• 2.4
• -2.4
• 4.8
• -4.8

What is meant by power of a lens?

A student uses a lens of focal length 40 cm. Calculate its power.

• 0.025
• 0.25
• 2.5
• 25

A divergent lens has a focal length of 30 cm. At what distance should an object of height 5 cm from the optical center of the lens be placed so that its image is formed 15 cm away from the lens?

• 30
• -30
• 15
• -15

A divergent lens has a focal length of 30 cm. An object of height 5 cm is placed at a distance of 30 cm from the optical center of the lens so that its image is formed 15 cm away from the lens. Calculate the size of the image

• 2.5
• 0.25
• -2.5
• -0.25