The ability of the human eye to focus object on the retina is referred to as the power of?
A. interference B. diffraction C. accommodation D. superposition Correct Answer: Option C – accommodation Explanation The leaves collapse as the position charges on the rod neutralize the negative charges on the...
When light passes through two media X and Y of refraction indices 1.51 and 1.33 respectively; The speed of light in?
A. x is the same as in y B. x and y is the same as in vacuum C. x is higher than in y D. y is higher than in x Correct Answer: Option D – y is higher than in x Explanation Since 1.51, the refractive index of X is greater than 1.33, the refractive index of y, the...
If the refractive index of crown glass is 1.51; its critical angel is?
A. 48.6° B. 22.5° C. 41.5° D. 45.0° Correct Answer: Option C = 41.5° Explanation SinC = (1)/n = (1)/1.51 = 0.6622 ∴ C = sin +0.6622 = 41.47
Calculate the position of an object placed in front of a convex mirror having focal length of 12cm such that an image is formed 6 cm away from the mirror?
A. 4. 0 cm B. 3. 0 cm C. 12.0 cm D. 9.0 cm Correct Answer: Option C = 12.0 cm Explanation f = -12 cm, v = – 6 cm (1)/v + (1)/u =(1)/f (1)/-6 + (1)/u = (1)/-12 (1)/u = (1)/-12 + (1)/6 = (1 + 2)/12 = (1)/12 ∴ u = 12...
An object is placed 5 cm from the pole of a concave mirror. If the focal length of the mirror is 10 cm. What is the image distance?
A. 10 cm in front of the mirror. B. 5 cm in front of the mirror C. 10 cm behind the mirror D. 5 cm behind the mirror Correct Answer: Option C = 10 cm behind the mirror Explanation u = 5 cm , f = 10 cm, v = ? (1)/v + (1)/u = (1)/f (1)/v + (1)/5 = (1)/10 = (1)/v =...Products
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