Match the corresponding entries of column 1 with column 2. [Where m is the magnification produced by the mirror] Column 1 Column 2 (A) m = - 2 (a) Convex mirror (B) m = - 1 2 (b) Concave mirror (C) m = + 2 (c) Real image (D) m = + 1 2 (d) Virtual image

A → b and c; B → b and c; C → b and d; D → a and d

A → a and c; B → a and d; C → a and b; D → c and d

A → a and d; B → b and c; C → b and d; D → b and c

A → c and d; B → b and d; C → b and c; D → a and d

A ray of light wavelength λ 0 and frequency v 0 enters a glass slab of refractive index μ from air. Then,

Δ λ = λ 0 1 μ - 1 and Δ v ⁡ = 0

Its wavelength increases, frequency decreases

Its wavelength increases, frequency remains same

EASY

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Important Questions on Ray Optics

HARD

Physics>Optics>Ray Optics>Basic Terms in Geometrical Optics

A plano-convex lens is made of a material of refractive index n. When a small object is placed 30 cm away in front of the curved surface of the lens, an image of double the size of the object is produced. Due to reflection from the convex surface of the lens, another faint image is observed at a distance of 10 cm away from the lens. Which of the following statement(s) is (are) true?

EASY

Physics>Optics>Ray Optics>Basic Terms in Geometrical Optics

In a medium the speed of light wave decreases to $0.2$ times to its speed in free space. The ratio of relative permittivity to the refractive index of the medium is $x : 1$ . The value of $x$ is ______.

(Given speed of light in free space $= 3 \times 10^{8} m s^{- 1}$ and for the given medium $μ_{r} = 1$ )

MEDIUM

Physics>Optics>Ray Optics>Basic Terms in Geometrical Optics

Match the corresponding entries of column 1 with column 2. [Where m is the magnification produced by the mirror]

	Column 1		Column 2
(A)	$m = - 2$	(a)	Convex mirror
(B)	$m = - \frac{1}{2}$	(b)	Concave mirror
(C)	$m = + 2$	(c)	Real image
(D)	$m = + \frac{1}{2}$	(d)	Virtual image

MEDIUM

Physics>Optics>Ray Optics>Basic Terms in Geometrical Optics

A light wave is incident normally on a glass slab of refractive index

1.5 .

4 %

of light gets reflected and the amplitude of the electric field of the incident light is

30 \frac{V}{m},

then the amplitude of the electric field for the wave propagating in the glass medium will be:

EASY

Physics>Optics>Ray Optics>Basic Terms in Geometrical Optics

Red light differs from blue light as they have :

HARD

Physics>Optics>Ray Optics>Basic Terms in Geometrical Optics

The eye can be regarded as a single refracting surface. The radius of curvature of this surface is equal to that of the cornea

(7 .8 mm)

. This surface separates two media of refractive indices

1

and

1.34

. Calculate the distance from the refracting surface at which a parallel beam of light will come to focus.

MEDIUM

Physics>Optics>Ray Optics>Basic Terms in Geometrical Optics

A ray of light wavelength

λ_{0}

and frequency v₀ enters a glass slab of refractive index

μ

from air. Then,

MEDIUM

Physics>Optics>Ray Optics>Basic Terms in Geometrical Optics

You are asked to design a shaving mirror assuming that a person keeps it at

10 cm

from his face and views the magnified image of the face at the closest comfortable distance of

25 cm

. The radius of curvature of the mirror would then be:

EASY

Physics>Optics>Ray Optics>Basic Terms in Geometrical Optics

The dimensional formula of

μ_{0} \in_{0}

is _____

HARD

Physics>Optics>Ray Optics>Basic Terms in Geometrical Optics

The relative permittivity of distilled water is

81 .

The velocity of light in it will be:

(

Given

μ_{r} = 1)

MEDIUM

Physics>Optics>Ray Optics>Basic Terms in Geometrical Optics

A point source of light, $S$ is placed at a distance $L$ in front of the center of plane mirror of width $d$ which is hanging vertically on a wall. A man walks in front of the mirror along a line parallel to the mirror, at a distance $2 L$ as shown below. The distance over which the man can see the image of the light source in the mirror is:

Question Image

HARD

Physics>Optics>Ray Optics>Basic Terms in Geometrical Optics

For a concave lens of focal length

f

, the relation between object and image distance

u

and

v,

respectively, from its pole can best be represented by (

u = v

is the reference line):

HARD

Physics>Optics>Ray Optics>Basic Terms in Geometrical Optics

A wire is bent in the shape of a right angled triangle and is placed in front of a concave mirror of focal length

f

, as shown in the figure. Which of the figures shown in the four options qualitatively represent(s) the shape of the image of the bent wire? (These figures are not to scale.)
Question Image

HARD

Physics>Optics>Ray Optics>Basic Terms in Geometrical Optics

A transparent slab of thickness

d

has a refractive index

n (z)

that increases with

z

. Here

z

is the vertical distance inside the slab, measured from the top. The slab is placed between two media with uniform refractive indices

n_{1} and n_{2} (> n_{1}),

as shown in the figure. A ray of light is incident with angle

θ_{i}

from medium 1 and emerges in medium 2 with refraction angle

θ_{f}

with a lateral displacement

l

. Which of the following statement(s) is (are) true?
Question Image

MEDIUM

Physics>Optics>Ray Optics>Basic Terms in Geometrical Optics

Diameter of a plano - convex lens is

6 cm

and thickness at the centre is

3 mm

. If the speed of light in the material of lens is

2 \times 1 0^{8} m s^{- 1}

, the focal length of the lens is:

EASY

Physics>Optics>Ray Optics>Basic Terms in Geometrical Optics

When the same monochromatic ray of light travels through glass slab and through water, the number of waves in glass slab of thickness

6 cm

is same as in water column of height

7 cm

. If refractive index of glass is

1.5

then refractive index of water is

EASY

Physics>Optics>Ray Optics>Basic Terms in Geometrical Optics

An air bubble in a glass slab with refractive index

1.5

(near-normal incidence) is

5 cm

deep when viewed from one surface and

3 cm

deep when viewed from the opposite face. The thickness (in

cm

) of the slab is

MEDIUM

Physics>Optics>Ray Optics>Basic Terms in Geometrical Optics

Car

B

overtakes another car

A

at a relative speed of

40 {m s}^{- 1}

. How fast will the image of car

B

appear to move in the mirror of focal length

10 cm

fitted in car

A

, when the car

B

1.9 m

away from the car

A

HARD

Physics>Optics>Ray Optics>Basic Terms in Geometrical Optics

The following graph depicts the inverse of magnification versus the distance between the object and lens data for a setup. The focal length of the lens used in the setup is

Question Image

Distance between the object and the lens $(m)$

MEDIUM

Physics>Optics>Ray Optics>Basic Terms in Geometrical Optics

A compound microscope consists of an objective lens of focal length

1 cm

and an eye piece of focal length

5 cm

with a separation of

10 cm .

The distance between an object and the objective lens, at which the strain on the eye is minimum is

\frac{n}{40} cm .

The value of

n

is.......

Assertion : We can't see virtual images from our eyes. Reason : Virtual image can not be formed on the screen.

Important Questions on Ray Optics

Learn and Prepare for any exam you want !

Assertion : We can't see virtual images from our eyes.

Reason : Virtual image can not be formed on the screen.