# Ray Optics-Lens Maker's Formula and Lens Formula (KVPY (Kishore Vaigyanik Protsahan Yojana) Stream-SA (Class 11) Physics): Questions 1 - 4 of 7

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## Question number: 1

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

Appeared in Year: 2011

MCQ▾

### Question

A convex lens is used to form an image of an object on a screen. If the upper half of the lens is blackened so that it becomes opaque, then

### Choices

Choice (4) Response

a.

the image position shifts towards the lens

b.

the image position shifts away from the lens

c.

only half of the image will be visible

d.

the brightness of the image reduces

## Question number: 2

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

MCQ▾

### Question

A convex lens made of material of refractive index 1.45 is immersed in a medium of refractive index 2.2. The two surfaces of the convex lens have the same radius of curvature 0.6 m. The lens will behave as a,

### Choices

Choice (4) Response

a.

Convergent lens of focal length 0.44 m.

b.

Divergent lens of focal length 0.44m

c.

Convergent lens of focal length 0.88 m

d.

Divergent lens of focal length 0.88 m.

## Question number: 3

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

MCQ▾

### Question

For an equal-convex lens of radius of curvature 25, the object placed in a medium of refractive index 1.33. On the image side the refractive index is 1.75. The focal length of this lens will be,

### Choices

Choice (4) Response

a.

51 cm

b.

79.16 cm

c.

69.26 cm

d.

88.55 cm

## Question number: 4

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

Appeared in Year: 2014

MCQ▾

### Question

A concave lens made of material of refractive index 1.6 is immersed in a medium of refractive index 2.0. The two surfaces of the concave lens have the same radius of curvature 0.2 m. The lens will behave as a,

### Choices

Choice (4) Response

a.

Convergent lens of focal length 0.5 m

b.

Divergent lens of focal length 0.4m

c.

Convergent lens of focal length 0.4 m.

d.

Divergent lens of focal length 0.5 m.