Refraction Of Light At Curved Surfaces

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Refraction Of Light At Curved Surfaces - 3

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District *

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01. If the behavior of light rays through a convex lens is as shown in the adjoining figure, then *

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μ = μ₂

μ > μ₂

μ < μ₂

μ ≤ μ₂

02. Which one is used to always get diminished and virtual image from the given below *

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Convex lens

Plano convex lens

Concave lens

Concave mirror

03. When an object is placed at principal focus the image formed due to convex lens is..... *

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enlarged

diminished

highly enlarged

point sized

04. A ray of light passes from glass into air. The angle of refraction will be..... *

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Equal to the angle of incidence

Greater than the angle of incidence

Smaller than the angle of incidence

45°

05. A light ray of light passes from a medium X to another medium Y. No refraction of light occurs if the ray of light hits the boundary of medium Y at an angle of ................... *

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0°

45°

90°

120°

06. Refractive indices of water, sulphuric acid, glass and carbon disulphide are 1.33, 1.43, 1.53 and 1.63. The light travels slowest in ................ *

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Sulphuric acid

Glass

Water

Carbon disulphide

07. The focal length of a lens depends upon *

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The radius of curvature of its surface

Material of the lens

Refractive index of the medium in which its placed

All of the above

08. According to sign convention, signs of u, R₂ in the following ray diagram are..... *

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+, +

+, -

-, +

-, -

09. Statement A: A light ray which is travelled through principle axis does not deviate from its path. Statement:B: A light ray which is travelled parallel to the principal axis does not deviate from its path. *

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A is correct and B is wrong

B is correct and A is wrong

Both A and B are correct

Both A and B are wrong

10. Assertion (A) : An air bubble in water behaves like a diverging lens. Reason(R):Air in the bubble has less refractive index than of water. *

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Both A and R are correct and R justifies A.

Both A and R are correct, but R doers not justify A.

Both A and A are wrong

A is correct but R is wrong.

11. Where should an object be placed in front of a convex lens to get a real image of the same size of the object..... *

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At the principal focus of the lens

At twice focal length

At infinity

Between the optical center of the lens and its principal focus

12. To get magnified real image on screen from a convex lens the object should be placed at a distance. *

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below the focal length

Beyond 2F₂

equal to focal length

Between F₂ and 2F₂

13. Which one of the following is the refracted ray? *

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14. Parallel rays making some angle with principal axis meet on............... after refraction. *

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Focus

Focal plane

Centre of curvature

any where

15. Lens formula for convex lens *

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16. Which of the following matching is incorrect? *

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17. The diagrams showing the correct path of the ray after passing through the *

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II and III only

I and II only

I, II and III

I, II and IV

18. A full length image of a distant tall building can definitely be seen by using *

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a concave mirror

a convex mirror

a plane mirror

both concave as well as plane mirror

19. Focal length of a concave mirror is *

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positive

negative

depends on the position of object

depends on the position of image

20. In optics an object which has higher refractive index is called.... *

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optically denser

refractive index

optical density

optically rarer

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