# Ray Optics (NEET (NTA)-National Eligibility cum Entrance Test (Medical) Physics): Questions 87 - 90 of 105

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## Question number: 87

» Ray Optics » Mirror Formula

MCQ▾

### Question

An object is placed at a distance of 50 cm from a convex mirror. A plane mirror is placed in front of the convex mirror in such a way that it convers half of the convex mirror. If the distance between object and plane mirror is 30 cm then there is no parallax between the images formed by two mirrors, the radius of curvature of convex mirror will be:

### Choices

Choice (4) Response

a.

50 cm

b.

25 cm

c.

100cm

d.

12.5 cm

## Question number: 88

» Ray Optics » Reflection and Refraction of Light » Spherical Surface

MCQ▾

### Question

The plane of a mirror makes an angle of 30° with horizontal. If a vertical ray is incident on a mirror, then what is the angle between mirror and reflected ray?

### Choices

Choice (4) Response

a.

90°

b.

60°

c.

30°

d.

45°

## Question number: 89

» Ray Optics » Snell's Law

MCQ▾

### Question

Light of wavelength 6000 Å enters from air into water (a medium of refractive index 4/3). Find the speed and wavelength [c = 3 × 10 8 m/s]

### Choices

Choice (4) Response

a.

3.15 × 10 8 m/s, 3500A

b.

2.25 × 10 8 m/s, 4500A

c.

1.25 × 10 8 m/s, 2500A

d.

3.45 × 10 8 m/s, 5500A

## Question number: 90

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

Assertion-Reason▾

### Assertion (Ꭺ)

There is no dispersion of light refracted through a rectangular glass slab.

### Reason (Ꭱ)

Dispersion of light is the phenomenon of splitting of a beam of white light into its constituent colors.

### Choices

Choice (4) Response

a.

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

b.

Ꭺ is false but Ꭱ is true

c.

Both Ꭺ and Ꭱ are false

d.

Both Ꭺ and Ꭱ are true but Ꭱ is NOT the correct explanation of Ꭺ