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  • A teacher gives a convex lens and a concave mirror of focal length of each to his student and asks him to find their focal lengths by obtaining the

A teacher gives a convex lens and a concave mirror of focal length of 20 \; cm each to his student and asks him to find their focal lengths by obtaining the image of a distant object. The student uses a distant tree as the object and obtains its sharp image, one by one, on a screen. The distances d_{1} and d_{2} between the lens/mirror and the screen in the two cases and the nature of their respective sharp images are likely to be

(a) (20\; cm,\; 40\; cm) and (erect and erect)

(b) (20\; cm,\; 40\; cm) and (inverted and inverted)

(c) (20\; cm,\; 20\; cm) and (inverted and inverted)

(d) (20\; cm,\; 40\; cm) and (erect and inverted)

Give reason for your answer.

 

 

 

 
 
 
 
 

Answers (1)

INVERTED.

 

This is because when the object is At infinity, the image is formed At focus.

Therefore, image distance = focal length.

Given,focal length = 20cm

Therefore,image distance = 20cm.

Moreover, when object is at infinity, the image is of point sized and inverted.

Posted by

Satyajeet Kumar

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