A ray of light falling on a $2^\circ$ -prism (thin prism) undergoes a $3^\circ$ -deviation on the first surface and no deviation on the second. The refractive index of the material of the prism is:
1. $1.5$
2. $1.75$
3. $2.0$
4. $2.5$

Subtopic: Prisms |

74%

From NCERT

1

2

3

4

To unlock all the explanations of this course, you need to be enrolled.

Hints

To unlock all the explanations of this course, you need to be enrolled.

Q33:

A ray of light

(1)

$(1)$ gets reflected partially at the front surface of a thin film of thickness

t,

$t,$ and refractive index

μ .

$\mu.$ The reflected ray from the front surface is

2

$2$ while that emerging due to reflection from the rear surface is

3.

$3.$ Assume that ray

1

$1$ is incident normally. The optical path difference between rays

2

$2$ and

3

$3$ is:

1.	$(\mu-1)t$	2.	$2(\mu-1)t$
3.	$\mu t$	4.	$2\mu t$

Subtopic: Refraction at Plane Surface |

From NCERT

1

2

3

4

To unlock all the explanations of this course, you need to be enrolled.

Hints

To unlock all the explanations of this course, you need to be enrolled.

Q34:

If two convex lenses of powers

P_{1}, P_{2}

$P_1,P_2$ be placed close together, co-axially, the combination behaves as a lens of power:

1.	$P_1+P_2$	2.	$\|P_1-P_2\|$
3.	${\Large\frac{P^2_1}{P_2}}$	4.	${\Large\frac{P^2_2}{P_1}}$

Subtopic: Lenses |

86%

From NCERT

1

2

3

4

To unlock all the explanations of this course, you need to be enrolled.

Hints

To unlock all the explanations of this course, you need to be enrolled.

Q35:

Two convex lenses

(L_{1}, L_{2})

$(L_1,L_2)$ of focal lengths,

20

$20$ cm

(L_{1})

$(L_1)$ and

40

$40$ cm

(L_{2}),

$(L_2),$ are placed co-axially at a separation of

60

$60$ cm. If a parallel beam of light is incident on

L_{1},

$L_1,$ the emerging beam from

L_{2}

$L_2$

1.	is parallel but wider.	2.	is parallel but narrower.
3.	is convergent.	4.	is divergent.

Subtopic: Refraction at Curved Surface |

56%

From NCERT

1

2

3

4

To unlock all the explanations of this course, you need to be enrolled.

Hints

To unlock all the explanations of this course, you need to be enrolled.

Q36:

A ray is incident normally onto the surface

A B

$AB$ of the prism

(∠ A = 30^{\circ}, ∠ B = 90^{\circ}) .

$(\angle A=30^\circ,\angle B=90^\circ).$ The refractive index of the material of the prism is

\sqrt{2} .

$\sqrt2.$ The deviation of this ray is:

1.

30^{\circ}

$30^\circ$ downward
2.

15^{\circ}

$15^\circ$ downward
3.

30^{\circ}

$30^\circ$ upward
4.

15^{\circ}

$15^\circ$ upward

Subtopic: Prisms |

70%

From NCERT

1

2

3

4

To unlock all the explanations of this course, you need to be enrolled.

Hints

To unlock all the explanations of this course, you need to be enrolled.

Q37:

A parallel beam of light is incident onto a converging lens

(L_{1})

$(L_1)$ of focal length

20 cm .

$20~\text{cm}.$ A second identical lens

(L_{2})

$(L_2)$ is to be placed behind

L_{1},

$L_1,$ coaxially, so that the emerging beam is parallel. The distance between

L_{1}

$L_1$ and

L_{2}

$L_2$ should be:

1.	$10$ cm	2.	$20$ cm
3.	$40$ cm	4.	zero

Subtopic: Lenses |

76%

From NCERT

1

2

3

4

To unlock all the explanations of this course, you need to be enrolled.

Hints

To unlock all the explanations of this course, you need to be enrolled.

Q38:

Given below are two statements:

Statement I:	In total internal reflection, the angle of incidence must be greater than a certain minimum angle which depends on the media involved.
Statement II:	Total internal reflection cannot occur when light is traveling from an optically rarer to an optically denser medium.

1.	Statement I is incorrect and Statement II is correct.
2.	Both Statement I and Statement II are correct.
3.	Both Statement I and Statement II are incorrect.
4.	Statement I is correct and Statement II is incorrect.

Subtopic: Total Internal Reflection |

75%

From NCERT

1

2

3

4

To unlock all the explanations of this course, you need to be enrolled.

Hints

To unlock all the explanations of this course, you need to be enrolled.

Q39:

Which, of the following, does not suffer from chromatic aberration?

1.	convex lens
2.	plano-convex lens
3.	concave lens
4.	concave mirror

Subtopic: Lenses |

79%

From NCERT

1

2

3

4

To unlock all the explanations of this course, you need to be enrolled.

Hints

To unlock all the explanations of this course, you need to be enrolled.

Q40:

A ray of light is incident on a mirror which is lying on the

x - y

$x\text-y$ plane. The reflected ray travels along the direction of the vector

3 \hat{i} - 4 \hat{j} + 2 \hat{k} .

$3\hat i-4\hat j+2\hat k.$ The incident ray must be along:

1.	$-3\hat i+4\hat j+2\hat k$	2.	$3\hat i-4\hat j-2\hat k$
3.	$-3\hat i-4\hat j+2\hat k$	4.	$-3\hat i+4\hat j-2\hat k$

Subtopic: Reflection at Plane Surface |

From NCERT

1

2

3

4

To unlock all the explanations of this course, you need to be enrolled.

Hints

To unlock all the explanations of this course, you need to be enrolled.

Q41:

Two identical right-angled prisms are placed back to back as shown. A ray of light, incident on the first prism, making an angle

θ

$\theta$ with its surface – passes through the system and emerges parallel to itself. The refractive index of the material of the prism is:

1.

\sin θ

$\sin\theta$
2.

\cos θ

$\cos\theta$
3.

\tan θ

$\tan\theta$
4.

\cot θ

$\cot\theta$

Subtopic: Refraction at Plane Surface |

51%

From NCERT

1

2

3

4

To unlock all the explanations of this course, you need to be enrolled.

Hints

To unlock all the explanations of this course, you need to be enrolled.

A ray of light falling on a $2^\circ$ -prism (thin prism) undergoes a $3^\circ$ -deviation on the first surface and no deviation on the second. The refractive index of the material of the prism is:
1. $1.5$
2. $1.75$
3. $2.0$
4. $2.5$

NEET Information

courses

Company

Botany Questions

Chemistry Questions

Physics Questions

Zoology Questions

A ray of light falling on a 2∘2∘2^\circ-prism (thin prism) undergoes a 3∘3∘3^\circ-deviation on the first surface and no deviation on the second. The refractive index of the material of the prism is: 1. 1.51.51.5 2. 1.751.751.75 3. 2.02.02.0 4. 2.52.52.5

Add Note

Highlight in NCERT

Add Note

Highlight in NCERT

Add Note

Highlight in NCERT

Add Note

Highlight in NCERT

Add Note

Highlight in NCERT

Add Note

Highlight in NCERT

Add Note

Highlight in NCERT

Add Note

Highlight in NCERT

Add Note

Highlight in NCERT

Add Note

Highlight in NCERT

NEET Information

courses

Company

Botany Questions

Chemistry Questions

Physics Questions

Zoology Questions

A ray of light falling on a $2^\circ$ -prism (thin prism) undergoes a $3^\circ$ -deviation on the first surface and no deviation on the second. The refractive index of the material of the prism is:
1. $1.5$
2. $1.75$
3. $2.0$
4. $2.5$