# Ray Optics-Power of a Lens (NEET (NTA)-National Eligibility cum Entrance Test (Medical) Physics): Questions 1 - 5 of 8

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## Question number: 1

» Ray Optics » Power of a Lens

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### Question

The plane surface of a Plano-convex lens is silvered If radius of curved surface is R and refractive index is µ, then the system behaves like a concave mirror whose radius will be,

### Choices

Choice (4) Response

a.

b.

c.

d.

## Question number: 2

» Ray Optics » Power of a Lens

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### 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 Figure is Plano- Convex Lens The Plano-convex lens is cut longitudinally along its principal axis into two equal parts and then they are joined as shown in figure.

### Choices

Choice (4) Response

a.

b.

2P

c.

P

d.

Zero

## Question number: 3

» Ray Optics » Power of a Lens

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### Question

An equiconvex lens has a power of 5 diopter. If it is made of glass of refractive index 1.5 then the radius of the curvature of each surface will be

### Choices

Choice (4) Response

a.

10 cm

b.

5 cm

c.

zero

d.

20 cm

## Question number: 4

» Ray Optics » Power of a Lens

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### Question

A convex lens of power 4D is kept in contact with a concave lens of power 3D, the effective power of combination will

### Choices

Choice (4) Response

a.

b.

c.

d.

## Question number: 5

» Ray Optics » Power of a Lens

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MCQ▾

### Question

A convex lens when placed in the first position forms a real image of an object on a fixed screen. The distance between the object and the screen is 75 cm. On displacing the lens from first position by 25 cm to the second position again a real image is formed on the screen. Then the focal length of the lens is

### Choices

Choice (4) Response

a.

33.3 cm

b.

50.3 cm

c.

16.7 cm

d.

25.0 cm

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