# Ray Optics (NEET (NTA)-National Eligibility cum Entrance Test (Medical) Physics): Questions 43 - 46 of 105

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## Question number: 43

» Ray Optics » Power of a Lens

MCQ▾

### Question

The power of a Plano-convex lens is P. If this lens is cut longitudinally along its principal axis into two equal parts and then they are joined as given in the figure. The power of combination will be

### Choices

Choice (4) Response

a.

P

b.

2P

c.

d.

Zero

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## Question number: 44

» Ray Optics » Mirror Formula

MCQ▾

### Question

The radius of a glass ball is 5 cm. There is an air bubble at l cm from the center of the ball and refractive index of glass is 1.5. The position of image viewed from surface near the bubble is.

### Choices

Choice (4) Response

a.

4.63 cm

b.

5.12 cm

c.

3.63 cm

d.

2.12 cm

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## Question number: 45

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

Assertion-Reason▾

### Assertion (Ꭺ)

The size of the mirror doesn’t affect the nature of the image.

### Reason (Ꭱ)

Small mirror always forms a virtual image.

### 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 true but Ꭱ is NOT the correct explanation of Ꭺ

d.

Ꭺ is true but Ꭱ is false

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## Question number: 46

» Ray Optics » Lens Maker's Formula and Lens Formula

Assertion-Reason▾

### Assertion (Ꭺ)

A double convex lens has focal length 10 cm. When the lens is immersed in water its focal length becomes 40 cm.

### Choices

Choice (4) Response

a.

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

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

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