Rohit was testing a convex lens of focal length 30 cm. He placed an object at various distances and noted the reading according to given observation table.

A convex lens of focal length 15 cm is placed on a plane mirror. An object is placed at 30 cm from the lens. The image is

A thin convex lens of focal length 30 cm is placed in front of a plane mirror. An object is placed at a distance x from the lens (not in between lens and mirror ) so that its final image coincides with itself. Then, the value of x is

A convex lens of focal length 30 cm produces 5 times magnified real image of an object. What is the object distance?

A convex lens of focal length 30 cm and a concave lens of focal length 60 cm are placed in combination. If an object is placed 40 cm away from the combination, find the position of the image.

A convex lens of focal length 20 cm and a concave lens of focal length 10 cm are placed 20 cm apart. In between them an object placed at distance x from the convex lens. What is the value of x (in cm ) so that images from by both the lenses coincides ?

Find distanace of image from a convex lens of focal length 20cm if object is placed at a distance of 30cm from the lens. Also find its magnification.

At what distance from a convex lens of focal length 30cm an object should be placed so that the size of image be (1)/(4) that of object?

A convex lens of focal length 20 cm and a concave lens of focal length 10 cm are placed 20 cm apart. In between them an object placed at distance x from the convex lens. What will be the linear magnification produced convex lens and concave lens individually ?