# Ray Optics-Resolving Power of Microscopes and Astronomical Telescopes (NEET (NTA)-National Eligibility cum Entrance Test (Medical) Physics): Questions 1 - 4 of 11

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## Question number: 1

» Ray Optics » Resolving Power of Microscopes and Astronomical Telescopes

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MCQ▾

### Question

A Galilean telescope consists of an objective of focal length 12 cm and eye-piece of focal length 4 cm. What should be the separation of the two lenses when the virtual image of a distant object is formed at a distance of 24 cm from the eye-piece?

### Choices

Choice (4) Response

a.

8.2 cm.

b.

7.2 cm

c.

12.4 cm.

d.

2.8cm.

## Question number: 2

» Ray Optics » Resolving Power of Microscopes and Astronomical Telescopes

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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.

2.61 cm

b.

1.67 cm

c.

3.12 cm

d.

1.55 cm

## Question number: 3

» Ray Optics » Resolving Power of Microscopes and Astronomical Telescopes

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Assertion-Reason▾

### Assertion (Ꭺ)

By increasing the diameter of the objective of telescope, we can increase its range.

### Reason (Ꭱ)

The range of a telescope tells us how far away a star of some standard brightness can be spotted by telescope.

### Choices

Choice (4) Response

a.

Ꭺ is false but Ꭱ is true

b.

Ꭺ is true but Ꭱ is false

c.

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

d.

Both Ꭺ and Ꭱ are false

## Question number: 4

» Ray Optics » Resolving Power of Microscopes and Astronomical Telescopes

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MCQ▾

### Question

The light gathering power of a camera lens doesn’t depend on

(1) Ratio of focal length and diameter

(2) Product of focal length and diameter

(3) Wavelength of light used

(4) Its diameter

Select the correct answers and mark it according to the following codes:

Codes:

### Choices

Choice (4) Response

a.

1 and 3 are correct

b.

2 and 4 are correc

c.

1 and 2 are correct

d.

1,2 and 3 are correct

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