Refraction of Light Test

Result

Refraction of Light Test - 4

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Question 1
1 / -0

What do you mean by refractive index?

A
It determines the degree to Which light bends while passing from one medium to another

B
Refractive index =

C
Refractive index =

D
All of these

Solution

Option (1) and (2), (3) are correct as Refractive index =
So option (2) and (3) are correct, also option (1) is correct.
Question 2
1 / -0

When an object is placed at infinity, Where is the image of object formed in case of convex lens?

A
At focus

B
At infinity

C
At pole

D
At 2f

Solution

When the object is placed at infinity, the two rays AO and BD running parallel to the principal axis get refracted at point O and D respectively and intersect each other at the principal focus. Therefore, in this case the image A'B' is formed at the focus, which is highly diminished (point sized), real and inverted.
Question 3
1 / -0

When an object is placed at 2f of convex llens, What is the nature and position of image formed?

A
At 2f, real, magnified, erect

B
At 3f, real, magnified, erect

C
At 2f, real,same size, inverted

D
At f, real, magnified, inverted

Solution

Correct Answer: At 2f, real, same size, inverted
Question 4
1 / -0

When an object is placed between 2f and f, Where is the image of the object formed and find the nature of image formed.

A
Beyond 2f, real and erect

B
Beyond 2f, real and inverted

C
At infinity, real, magnified, inverted

D
None of these

Solution

Correct Answer: Beyond 2f, real and inverted
Question 5
1 / -0

The speed of light in air is 3 x 10⁸ m/s and that of light in certain medium is 1 x 10⁸ m/s. What is the value of refractive index of medium w.r.t air?

A
2.5

B
3

C

D

Solution

Refractive index = =
refractive index = 3
Question 6
1 / -0

What is the value of speed of light in medium if the refractive index of medium with respect to air is ?
Take c = 3 x 10⁸ m/sec.

A
2.4 x 10⁸ m/sec

B
4.2 x 10⁶ m/sec

C
2.4 x 10⁶ m/sec

D
none of these
Question 7
1 / -0

What is the speed of light in diamond it refractive index of the diamond is 2.42?

A
2.14 × 10⁸ m/sec

B
1.24 × 10⁸ m/sec

C
1.24 × 10⁸ cm/sec

D
None of these

Solution

Speed of light in air = 3 × 10⁸m/sec
Refractive index = 2.42
Or speed of light in diamond = = 1.24 × 10⁸ m/sec.
Question 8
1 / -0

Which of the following is not true regarding rules of refraction?

A
Light bends away from the normal while traveling from an optically denser to a rarer medium.

B
Light bends while traveling from one medium to another only if it is incident on the boundary at an angle to the normal.

C
Light does not bends if it is incident perpendicular to the boundary or along the normal.

D
All are correct.

Solution

All the given options are correct, so 4^th option is the answer.
Question 9
1 / -0

What is not true regarding a prism?

A
A prism is a piece of glass

B
A prism has 2 rectangular faces

C
A prism has triangular faces

D
both (2) and (3)

Solution

A prism is a transparent optical element with more than two flat, polished surfaces that refract light. At least two of the flat surfaces must have an angle between them. The exact angles between the surfaces depend on the application.
Question 10
1 / -0

Which of the following is the possible relation in case of prism (triangular) prism?

A
< i + < d = < A + < e

B
< i + < e = < A + < d

C
< i - < e = < A + < d

D
< i - < e = < A - < d

Solution

< i + < e = < A + < d where < i - incidence angle,
above relation is always true about the refraction of light by prism.
Question 11
1 / -0

What is incorrect regarding dispersion?

A
Separation of white colour into its constituent

B
Separation of white light into its constituent

C
Rainbows is an example of dispersion

D
None of these

Solution

option (1) is not correct as dispersion is the separation of white light into its constituent colour. So 1^st option is incorrect.
Question 12
1 / -0

Which of the following is true regarding lenses?

A
A lens is a piece of transparent material bounded by curved surface.

B
Biconvex, concavo-convex and biconcave are converging lenses.

C
Convexo-concave, plano concave are examples of diverging lenses.

D
Both (1) and (3)

Solution

Options (1) and (3) are correct but option (2) is incorrect as biconvex, concavo-convex are converging lenses while biconcave lens is a diverging lens.
Question 13
1 / -0

Which of the following statements is/are correct?

A
Light rays coming from infinity, after passing through convex lens, meet at focus.

B
Light rays diverge, after passing through a concave lens.

C
A ray of light passing through the optical centre, travels without any deviation.

D
All of these.

Solution

All the given statements are true. Hence option (4) is the correct answer.
Light rays coming from infinity, after passing through convex lens, meet at focus.

Light rays diverge, after passing through a concave lens.

A ray of light passing through the optical centre, travels without any deviation.
Question 14
1 / -0

What do you mean by principal axis?

A
The line joining the two centres of curvature

B
The line joining the two radius of curvature

C
Principal axis is line which joins the pole and focus of a lens

D
None of the above

Solution

The line joining the two centres of curvature of a lens is called the principal axis or optical axis of the lens.
Question 15
1 / -0

An image formed by a concave lens is

A
real, erect and smaller than the object

B
virtual, erect and smaller than the object

C
virtual, invert and larger than the object

D
virtual, erect and larger than the object

Solution

An image formed by a concave lens is always virtual, erect and smaller than the object, irrespective of position of the object.