[" A full length image of a distant "],[" tall building can definitely be "],[" seen by using: "]

if you focus the image of a distant object, whose shape is given below, on a screen using a convex lens, the shape of the image of this object on the screen would be :

A student has obtained a point image of a distant object using a convex lens. To find the focal length of the convex lens, he should measure the distance between the :

A sharp image of a distant object is obtained on a screen by using a convex lens. In order to determine the focal length of the lens, you need to measure the distance between the :

A student performs an experiment to estimate the focal length of a convex lens by obtaining the image of a distant window on a white screen. The image formed on the white screen is :

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 :