A real image of an object fomed by a converging lens of focal length 15cm is three times the size of the object. What is the distance of the object from the lens?
A. 30cm B. 25cm C. 20cm D. 15cm E. 10cm Correct Answer: Option C – 20cm Explanation 1/u + 1/3u = 1/15; u = 20cm
As an object is moved close to the focus of a converging lens from infinity its image; Which of the statements above is/are correct?
I. moves closer to the lens II. moves away from the lens. III. Remains the same size. IV becomes smaller. A. III and IV only B. I and III only C. IV only D. III only E. II only Correct Answer: Option E – II...
The image of a pin formed by a diverging lens of focal length 10cm is 5cm from the lens. Calculate the distance of the pin from the lens
A. -3.3cm B. 3.3cm C. 10.0cm D. 15.0cm E. 20.0cm Correct Answer: Option B – 3.3cm Explanation 1/u – 1/v = 1/f; f = 10cm, v = 5cm u = 10/3 = 3.3cmWhich of the following statements is not correct for a light ray passing through a rectangular glass block which is surrounded by air? It
A. suffers a displacement at the point of emergence B. emerges parallel to the incident ray C. is partly reflected at the point of incidence D. is deviated at the point of emergence E. is reflected in the block Correct Answer: Option A – suffers a displacement...Products
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