The change of the direction of a wavefront as a result of a change in the velocity of the wave in another medium is called?
A. refraction B. reflection C. diffraction D. polarization Correct Answer: Option A – refraction
The angle of deviation of light of various colours passing through a glass prism decreases in the order of?
A. blue orange and red B. red, blue and orange C. blue, red and orange D. red, orange and blue E. orange, blue and red Correct Answer: Option C – blue, red and orange
Which of the following is used for controlling the amount of light entering the eye?
A. Cornea B. Pupil C. Iris D. Optic nerve E. Ciliary muscle Correct Answer: Option C – IrisWhen an astronomical telescope is in normal adjustment, the focal length of the objective lens is 50cm and that of the eyepiece is 2.50m. What is the distance between the lenses?
A. 20.0cm B. 47.5cm C. 50.0cm D. 52.5cm E. 125.0cm. Correct Answer: Option D Explanation Distance between lens = f0 + fe = 52.5cmProducts
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