Geometrical Optics – Online MCQs – Physics 10th

1. Which statement is correct?

A concave mirror and a convex mirror, both have negative focal lengths.

A concave mirror has a negative focal length, while a convex mirror has a positive focal length.

A concave mirror and a convex mirror, both have positive focal lengths.

A concave mirror has a positive focal length, while a convex mirror has a negative focal length.

2. To illuminate the inaccessible places in the tooth, dentists use:

convex mirror

concave glasses

concave lens

convex lens

3. When the angle of refraction is 90° and the refractive index for water is 1.33, the critical angle is:

50.0^o

48.8^o

51.0^o

49.1^o

4. The short-sightedness can be corrected by using:

concave mirror

convex mirror

concave glasses

convex glasses

5. A ray of light incident at an angle to the normal bends towards the normal when it enters into an optically:

denser medium and glass to air

denser medium

glass to air

less dense medium

6. When the angle of incidence becomes larger than the critical angle, then

no refraction occurs

reflection occurs

refraction occurs

dispersion occurs

7. Which statement is correct?

The power of a convex lens is negative, and that of a concave lens is positive.

The power of a convex lens is positive, and that of a concave lens is negative.

The power of both lenses is positive

The power of both lenses is negative

8. Concave lens is also called:

converging lens

none of above

magnifying glass

diverging lens

9. A ray of light perpendicular to the glass slab or along the normal is:

sometimes refracted

It depends on medium

not refracted

refracted

10. The power of a lens is measured in:

meter

meter^-1

meter²

meter^-2

11. Scientists believe that a human with a normal eye and regular vision can see the tiniest objects as small as about 0.1 millimeters,

0.1 mm

0.1 µm

0.1m

0.1 cm

12. Power of a lens is defined as the reciprocal of its:

principal axis

optical center

focal length in meters

pole

13. Magnification = ?

size of object / size of image

size of image x size of object

size of image / size of object

size of image + size of object

14. In a compound microscope, the focal length of the objective lens is:

zero

none of the above

large

short

15. Refraction of light is caused by a change in speed, at the interface of two different mediums:

frequency of the ray changes while the wavelength of light does not change

the wavelength of the ray changes while the frequency of light does not change

wavelength and frequency of the ray remain unchanged

Both, wavelength and frequency change

16. A magnifying glass forms:

real image

inverted image

virtual image

none of them

17. The defect in which the image is formed beyond the retina is called:

short sightedness

long sightedness

image defect

blind spotting

18. In a telescope, as compared to an eye piece, the objective lens has a focal length:

small

large

zero

negative

19. In a concave mirror, the image size depends upon:

position of the object

the shape of the object

size of the object

area covered by the object

20. Tick the correct mirror equation:

1/f = 1/p + 1/q

1/q = 1/f + 1/p

1/f = 1/q + 1/p

1/p = 1/f + 1/q

Online MCQs Test | Unit 13 : Geometrical Optics | Physics Class 10th | Sindh Board Science Group