Class 10 Quiz Level 3 (Difficult) – Light Reflection and Refraction

Total questions: 10

A convex lens forms a real and inverted image of an object placed 40 cm from the lens. If the image is formed 20 cm from the lens, what is the focal length of the lens?

Topic: Refraction by Lenses

Deselect Answer

30 cm

40 cm

15 cm

10 cm

None

A person with hypermetropia uses a convex lens with a power of +2.5D . what is the focal length of the lens?

Topic: Human Eye

Deselect Answer

0.4 m

0.5 m

0.25 m

0.2 m

None

A concave lens of focal length 20 cm forms an image 10 cm from the lens. The object distance is?

Topic: Refraction by Lenses

Deselect Answer

30 cm

20 cm

15 cm

10 cm

None

A beam of light enters from air (n=1.00) into a medium with a refactive index of 2.00 at an angle of $ \displaystyle 30{}^\circ $ . calculate the angle of refraction?

Topic: Reflection of Light

Deselect Answer

$ \displaystyle 14.5{}^\circ $

$ \displaystyle 15.0{}^\circ $

$ \displaystyle 15.5{}^\circ $

$ \displaystyle 16.0{}^\circ $

None

A concave mirror has a focal length of 20 cm .an object is placed 60 cm from the mirror . calculate the position and nature of the image formed .

Topic: Spherical Mirrors

Deselect Answer

30 cm , real and inverted

40 cm ,virtual and erect

30 cm ,virtual and erect

40 cm , real and inverted

None

An object is placed 20 cm from a concave mirror with a focal length of 10 cm . determine the position and nature of the image formed?

Topic: Reflection of Light

Deselect Answer

20 cm, real and inverted

20 cm, virtual and erect

10 cm, real and inverted

10 cm, virtual and erect

None

A person with presbyopia needs bifocal lenses. If the near vision correction requires a power of +2.5 D and the distance vision correction requires -1.0D , what is the combined power of the bifocal lens?

Topic: Human Eye

Deselect Answer

+1.5D

+2.0D

+1.5D and -1.0D

+2.5D and -1.0D

None

A convex mirror has a focal length of 20 cm .An object is placed 40 cm from the mirror . determine the position and nature of the image formed.

Topic: Spherical Mirrors

Deselect Answer

13.33cm, virtual and erect

20.00cm, virtual and erect

26.67cm, real and inverted

33.33cm, virtual and erect

None

A person with myopia uses a concave lens with a power of -3.0D .what is the focal length of the lens?

Topic: Human Eye

Deselect Answer

0.3m

-0.3m

0.33m

-0.33m

None

10.

A light passes from air into a glass slab(n=1,5)and then into water (n=1.33)at an angle of incidence of $\displaystyle 60{}^\circ $ . what is the angle of reflection in water?

Topic: Refraction of Light

Deselect Answer

$\displaystyle 25.3{}^\circ $

$\displaystyle 27.8{}^\circ $

$\displaystyle 28.1{}^\circ $

$\displaystyle 30.2{}^\circ $

None

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Class 10 Quiz Level 3 (Difficult) – Light Reflection and Refraction

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