# Ray Optics (NEET Physics): Questions 17 - 20 of 105

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## Question number: 17

» Ray Optics » Mirror Formula

MCQ▾

### Question

convex mirror is used to form the image of an object. Which of the following statements is wrong?

### Choices

Choice (4) Response

a.

The image lies between the pole and the focus

b.

The image is diminished in size

c.

The image is real

d.

The image is erect

## Question number: 18

MCQ▾

### Question

A vertical microscope is focused on a point at the bottom of an empty tank. Water (μ = 4/3) is then poured into the tank. The height of the water column is 4 cm. Another lighter liquid, which does not mix with water and which has refractive index 3/2 is then poured over the water. The height of liquid column is 2cm. What is the vertical distance through which the microscope must be moved to bring the object in focus again?

### Choices

Choice (4) Response

a.

1.55 cm

b.

2.61 cm

c.

1.67 cm

d.

3.12 cm

## Question number: 19

» Ray Optics » Snell's Law

Assertion-Reason▾

### Assertion (Ꭺ)

The focal length of a lens is different for all colors of light

### Reason (Ꭱ)

The focal length depends only upon the material of the lens.

### Choices

Choice (4) Response

a.

Ꭺ is true but Ꭱ is false

b.

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

c.

Ꭺ is false but Ꭱ is true

d.

Both Ꭺ and Ꭱ are false

## Question number: 20

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

MCQ▾

### Question

A prism of dispersive power 0.021 and refractive index 1.53 form an achromatic combination with prism of angle 4.2° and dispersive power 0.045 having refractive index 1.65. Find the resultant deviation.

### Choices

Choice (4) Response

a.

4.18°

b.

2.16°

c.

1.12°

d.

3.12°

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