A teacher gives a convex lens and a concave mirror of focal length of about 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 teacher gives a convex lens and a concave mirror of focal length of

1.	A teacher gives a convex lens and a concave mirror of focal length of about 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 :
Answer» (20 cm, 40 cm) and (erect, erect) (20 cm, 40 cm) and (INVERTED, erect) (20 cm, 20 cm) and (inverted, inverted) (20 cm, 20 cm) and (erect, inverted) Solution :NA