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Q.

A student uses a converging lens to produce an enlarged virtual image of a scale she wishes to read accurately. The focal length of the lens is 10cm.What is a suitable distance between the scale and the lens?


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a

8cm

b

10cm

c

15cm

d

20cm 

answer is A.

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Detailed Solution

Concept: In order to read the scale accurately, the student has shown that he wants to have a magnified virtual image of the scale using a condensing lens. The focal length of the condensing lens used by students is 10 cm
Question ImageWe know that with the help of a condensing lens, we can only get a magnified virtual image of an object if it is placed between the lenses and the focal point of the lens.
Mentioned here that the focus of the condensing lens used by the students is at a distance of
10 cm from the condensing lens. Therefore, to get a magnified virtual image of the scale, students need to place a scale  less than 10 cm from the lens. Of the options given, only one option has a distance of less than 10 cm .
That is, the 8cm given in Option 1. Therefore, the proper distance between the lens and the scale to accurately read the scale  in the scale image  is 8 cm.
Hence, the correct answer option (1) .
 
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A student uses a converging lens to produce an enlarged virtual image of a scale she wishes to read accurately. The focal length of the lens is 10cm.What is a suitable distance between the scale and the lens?