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If the magnitude of dispersive powers of two lenses are $0.024$ and $0.036$ . Then their focal lengths will be for aberration-free combination.

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Important Questions on Optics

EASY

Physics>Optics>Optics>Defects of Lenses

The refracting angle of a prism is

A

, and refractive index of the material of the prism is

\cot (\frac{A}{2})

. The angle of minimum deviation is

MEDIUM

Physics>Optics>Optics>Defects of Lenses

A deviation of $2 °$ is produced in the yellow ray when prism of crown and flint glass are achromatically combined. Taking dispersive powers of crown and flint glass are $0.02$ and $0.03$ respectively and refractive index for yellow light for these glasses are $1.5$ and $1.6$ respectively. The refracting angles for crown glass prism will be ________ $°$ (in degree)

(Round off to the Nearest Integer)

MEDIUM

Physics>Optics>Optics>Defects of Lenses

What is the required condition, if the light incident on one face of a prism, does not emerge from the other face?

HARD

Physics>Optics>Optics>Defects of Lenses

In an experiment for determination of refractive index of glass of a prism by

i

v/s

δ

plot, it was found that a ray incident at angle

35^{o}

, suffers a deviation of

40^{o}

and that it emerges at angle

79^{o}

. In that case which of the following is closest to the maximum possible value of the refractive index?

MEDIUM

Physics>Optics>Optics>Defects of Lenses

A prism has a refracting angle of

60^{o} .

When placed in the position of minimum deviation, it produces a deviation of

30^{o} .

The angle of incidence is

EASY

Physics>Optics>Optics>Defects of Lenses

A thin prism having refracting angle

10^{o}

is made of glass of refractive index 1.42. This prism is combined with another thin prism made of glass of refractive index 1.7. This combination produces dispersion without deviation. The refracting angle of second prism should be

EASY

Physics>Optics>Optics>Defects of Lenses

The graph between angle of deviation

(δ)

and angle of incidence

(i)

for a triangular prism is represented by :

MEDIUM

Physics>Optics>Optics>Defects of Lenses

The focal length of a thin convex lens for red and blue rays are

100 cm

and

96.8 cm

respectively. Then, the dispersive power of the material of the lens is

HARD

Physics>Optics>Optics>Defects of Lenses

Monochromatic light is incident on a glass prism of angle A. If the refractive index of the material of the prism is

μ

, a ray, incident at an angle

θ

, on the face AB would get transmitted through the face AC of the prism provided:

Question Image

EASY

Physics>Optics>Optics>Defects of Lenses

The angle of incidence for a ray of light at a refracting surface of a prism is

45^{o}

. The angle of prism is

60^{o}

. If the ray suffers minimum deviation through the prism, the angle of minimum deviation and refractive index of the material of the prism respectively, are:

EASY

Physics>Optics>Optics>Defects of Lenses

A ray of light is incident at

60 °

on one face of a prism of angle

30 °

and the emergent ray makes

30 °

with the incident ray. The refractive index of the prism is

MEDIUM

Physics>Optics>Optics>Defects of Lenses

An optical system consists of two lenses, one with focal length

50 cm

and the other with focal length

2.5 cm

. The separation between the lenses is

52.5 cm

. The optical system is most likely

EASY

Physics>Optics>Optics>Defects of Lenses

A certain prism is found to produce a minimum deviation of

38 °

. It produces a deviation of

44 °

when the angle of incidence is either

42 °

62 °

. What is the angle of incidence when it is undergoing minimum deviation?

EASY

Physics>Optics>Optics>Defects of Lenses

A ray of light is incident at an angle of

60^{\circ}

on one face of a prism of angle

30^{\circ}

. The emergent ray of light makes an angle of

30^{\circ}

with incident ray. The angle made by the emergent ray with second face of prism will be:

EASY

Physics>Optics>Optics>Defects of Lenses

A ray is incident at an angle of incidence

i

on one surface of a small angle prism (with angle of prism

A

) and emerges normally from the opposite surface. If the refractive index of the material of the prism is

μ

, then the angle of incidence is nearly equal to:

EASY

Physics>Optics>Optics>Defects of Lenses

In which colour have maximum dispersion

MEDIUM

Physics>Optics>Optics>Defects of Lenses

The refracting angle of prism is

A

and refractive index of material of prism is

\cot \frac{A}{2}

. The angle of minimum derivation is

EASY

Physics>Optics>Optics>Defects of Lenses

A parallel beam of light is incident from air at an angle

α

on the side PQ of a right angled triangular prism of refractive index

n = \sqrt{2}

. Light undergoes total internal reflection in the prism at the face PR when

α

has a minimum value of

45^{o} .

The angle

θ

of the prism is:

Question Image

MEDIUM

Physics>Optics>Optics>Defects of Lenses

A ray

P Q

incident on the refracting face

B A

is refracted in the prism

B A C

as shown in the figure and emerges from the other refracting face

A C

R S

such that

A Q = A R .

If the angle of prism

A = 60^{o}

and the refractive index of the material of prism is

\sqrt{3}

, then the angle of deviation of the ray is

Question Image

EASY

Physics>Optics>Optics>Defects of Lenses

Two lenses of power

- 1.6

D and

+ 2.1

D respectively are placed in contact. The focal length of the combination is

If the magnitude of dispersive powers of two lenses are 0.024 and 0.036. Then their focal lengths will be for aberration-free combination.

Important Questions on Optics

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If the magnitude of dispersive powers of two lenses are $0.024$ and $0.036$ . Then their focal lengths will be for aberration-free combination.