# Ray Optics-Deviation and Dispersion of Light by a Prism (NEET (National Eligibility cum Medical Entrance Test) Physics): Questions 10 - 14 of 17

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## Question number: 10

» Ray Optics » Deviation and Dispersion of Light by a Prism

Assertion-Reason▾

### Assertion (Ꭺ)

A rainbow cannot be seen at noon, when the sun is high in the sky.

### Reason (Ꭱ)

A rainbow is formed by dispersion of light.

### Choices

Choice (4) Response

a.

Both Ꭺ and Ꭱ are false

b.

Ꭺ is false but Ꭱ is true

c.

Ꭺ is true but Ꭱ is false

d.

Both Ꭺ and Ꭱ are true and Ꭱ is the correct explanation of Ꭺ

## Question number: 11

» Ray Optics » Deviation and Dispersion of Light by a Prism

MCQ▾

### Question

Calculate the dispersive power for crown glass from the (given data: )

### Choices

Choice (4) Response

a.

0.0163

b.

0.0183

c.

0.0112

d.

0.0142

## Question number: 12

» Ray Optics » Deviation and Dispersion of Light by a Prism

MCQ▾

### Question

A prism having an apex angle 4° and refraction index 1.5 is located in front of a vertical plane mirror as shown in figure. Through what total angle is the ray deviated after reflection from the mirror?

### Choices

Choice (4) Response

a.

176°

b.

c.

178°

d.

## Question number: 13

» Ray Optics » Deviation and Dispersion of Light by a Prism

MCQ▾

### Question

A glass prism of refractive index 1.5 and angle of prism 6° is put in contact with another prism of refractive index 1.6 when a ray of light is made incident on this combination normally then it emerges out undeviated. The angle of second prism will be

### Choices

Choice (4) Response

a.

b.

c.

6 0

d.

## Question number: 14

» Ray Optics » Deviation and Dispersion of Light by a Prism

MCQ▾

### Question

A ray of light fall normally on a refracting face of a prism of refractive index 1.5. Find the angle of the prism if the ray just fails to emerge from the prism.

### Choices

Choice (4) Response

a.

55°

b.

22°

c.

12°

d.

42°

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