Light, Reflection and Refraction | 1.9K plays

1.

Multiple Choice

1 min

1 pt

When light falls on a smooth polished surface, most of it

is reflected in the same direction

is reflected in different directions

is scattered

is refracted into the second medium

2.

Multiple Choice

1 min

1 pt

A student does the experiment on tracing the path of a ray of light passing through a rectangular glass slab for different angles of incidence. He can get a correct measure of the angle of incidence and the angle of emergence by following the labelling indicated in figure:

I

II

III

IV

3.

Multiple Choice

1 min

1 pt

If the image is formed in front of the mirror, then the image distance will be

positive or negative depending on the size of the object

positive

negative

neither positive nor negative

4.

Multiple Choice

1 min

1 pt

When the object is placed between f and 2f of a convex lens, the image formed is

at f

at 2f

beyond 2f

between O and f

5.

Multiple Choice

1 min

1 pt

A spherical mirror and a spherical lens each have a focal length of -10 cm. The mirror and the lens are likely to be

the mirror is convex and the lens is concave

the mirror is concave and the lens is convex

both convex

both concave

6.

Multiple Choice

1 min

1 pt

Focal length of a concave mirror is

negative

positive

depends on the position of object

depends on the position of image

7.

Multiple Choice

1 min

1 pt

The image formed by a convex lens can be

virtual image is not formed

virtual and of same size

virtual and diminished

virtual and magnified

8.

Multiple Choice

1 min

1 pt

If an incident ray passes through the focus, the reflected ray will

pass through the pole

be parallel to the principal axis

retrace its path

pass through the center of curvature

9.

Multiple Choice

1 min

1 pt

The speed of light in vacuum is

$3\times10^8m/s$

$2.8\times10^8m/s$

$3\times10^7m/s$

$3\times10^9m/s$

10.

Multiple Choice

1 min

1 pt

Power of a lens is the ………. of its focal length.

value

reciprocal

2 times

half

11.

Multiple Choice

1 min

1 pt

Image formed by reflection from a plane mirror is

real and inverted

virtual and erect

real and erect

virtual and inverted

12.

Multiple Choice

1 min

1 pt

Magnifying power of a concave lens is

can have any value

always = 1

always < 1

always > 1

13.

Multiple Choice

1 min

1 pt

A point object is placed at a distance of 20 cm from a convex mirror of focal length 20 cm. The image will form at:

at infinity

at focus

at the pole

behind the mirror

14.

Multiple Choice

1 min

1 pt

If the power of a lens is – 2 D, what is its focal length?

+50 cm

-50 cm

-100 cm

+100 cm

15.

Multiple Choice

1 min

1 pt

If the magnification produced by a lens has a negative value, the image will be

real and inverted

real and erect

virtual and erect

virtual and inverted

16.

Multiple Choice

1 min

1 pt

Which mirror can produce a virtual, erect and magnified image of an object?

Both concave and convex mirrors

Plane mirror

Convex mirror

Concave mirror

17.

Multiple Choice

1 min

1 pt

A ray of light is travelling from a rarer medium to a denser medium. While entering the denser medium at the point of incidence, it

does not enter at all

goes straight into the second medium

bends away from the normal

bends towards the normal

18.

Multiple Choice

1 min

1 pt

A ………. mirror is used as a head mirror by the doctors to concentrate light on the body parts to be examined.

concave

convex

19.

Multiple Choice

1 min

1 pt

No matter how far you stand from a spherical mirror, your image appears erect. The mirror may be plane or convex mirror.

True

False

20.

Multiple Choice

1 min

1 pt

The optical phenomena, twinkling of stars, is due to

Atmospheric reflection

Total reflection

Atmospheric refraction

Total refraction

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