Geometrical Optics – Online MCQs – Physics 10th

1. Which statement is correct?

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

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

2. In the optic fiber, the core is made of glass or plastic of relatively:

low refractive index

high refractive index

no refractive index

zero refractive index

3. The ciliary muscles of the eye control the:

pupil

lens movement

lens curvature and focal length

retina

4. In a compound microscope, as compared to an objective, the eyepiece lens has a focal length:

negative

small

zero

large

5. The S.I unit of power of a lens is:

meter^-1

Hertz

diopter

watts

6. 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

Both, wavelength and frequency change

wavelength and frequency of the ray remain unchanged

7. The outer concentric shell of the fibre optics is called:

cladding

prism

diopters

core

8. A compound microscope uses

1 lens

4 lenses

5 lenses

2 lenses

9. The power of a lens is measured in:

meter

meter^-1

meter^-2

meter²

10. A ray of light bends away from the normal when it enters an optically

None of them

glass to air

less dense medium and glass to air

less dense medium

11. The entire light is reflected into the same denser medium, which is called total:

external refraction

external reflection

internal reflection

Internal refraction

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

less dense medium

denser medium

denser medium and glass to air

glass to air

13. magnifying glass is also called:

telescope

simple microscope

endoscope

compound microscope

14. The focus lies behind the mirror in:

None of them

plane mirror

convex mirror

concave mirror

15. In the normal human eye, the image is formed:

on the retina

in between lens and retina

in front of the retina

behind the retina

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

blind spotting

short sightedness

long sightedness

image defect

17. For refractive index:

n = c + v

n = c/v

n = v/c

n = cv

18. Which one of these has the largest refractive index?

Diamond

Ice

Glass

Water

19. An optical fiber comprises:

five parts

two parts

four parts

three parts

20. The ratio of the sine angle of incidence to the sine angle of refraction gives us a constant called the:

refractive index of the medium

angle of refraction

angle of incidence

angle of reflection

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