TNPSCGURU.In - Tamil Nadu 10th Science - Physics - Unit - 2

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TNPSCGURU.In - Tamil Nadu 10th Science - Physics - Unit - 2 - OPTICS

1. The refractive index of four substances A, B, C and D are 1.31, 1.43, 1.33, 2.4 respectively. The speed of light is maximum in

1 point

a) A

b) B

c) C

d) D

Clear selection

2. Where should an object be placed so that a real and inverted image of same size is obtained by a convex lens

1 point

a) f

b) 2f

c) infnity

d) between f and 2f

Clear selection

3. A small bulb is placed at the principal focus of a convex lens. When the bulb is switched on, the lens will produce

1 point

a) a convergent beam of light

b) a divergent beam of light

c) a parallel beam of light

d) a coloured beam of light

Clear selection

4. Magnifcation of a convex lens is

1 point

a) Positive

b) negative

c) either positive or negative

d) zero

Clear selection

5. A convex lens forms a real, diminished point sized image at focus. Ten the position of the object is at

1 point

a) focus

b) infnity

c) at 2f

d) between f and 2f

Clear selection

Clear form

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