Light - Study Mode

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[#231] When a beam of white light passes through a glass prism, the colour of light beam that deviates the least is

(A) blue

(B) red

(C) green

(D) violet

Correct Answer

(B) red

[#232] Absolute refractive index of diamond is . . . . . . . .

(A) 2.32

(B) 2.42

(C) 2.23

(D) 2.24

Correct Answer

(B) 2.42

[#233] The focal length of the objective lens of a telescope is 50 cm. If the magnification of the telescope is 25, then the focal length of the eyepiece is

(A) 12.5 cm

(B) 5 cm

(C) 2 cm

(D) 10 cm

Correct Answer

(C) 2 cm

[#234] In the absence of the earth's atmosphere, sky would appear

(A) blue

(B) deep red

(C) white

(D) black

Correct Answer

(D) black

[#235] A concave mirror is placed in front of the sun in such a way that the rays of the sun converge at a point 5 m away on the main axis of the mirror. Now if a candle 3 m long is placed at a distance of 10 m on the main axis of the mirror, how far will the image of the candle will be formed?

(A) 5 cm

(B) 15 cm

(C) 10 cm

(D) 20 cm

Correct Answer

(C) 10 cm