An image of a candle on a screen is found to be double its size. When the candle is shifted by a distance of 5cm, then the image becomes triple its size. Find the nature and radius of curvature of the mirror.

The image of the flame of a candle due to a mirror is formed on a screen at a distance of 9cm from the candle. The image is magnified 4 times. Determine the nature, position and focal length of the mirror.

A convex lens produces an image of a condle flame upon a screen whose distance from candle is D. When the lens is displaced through a distance x , (the distance between the candle and the screen is kept constant), it is found that a sharp image is again produced upon the screen. Find the focal length of the lens in terms of D and x .

A lens placed between a candle and a fixed screen forms a real triply magnified image of the candle on the screen. When the lens is moved away form the candle by 0.8m without changing the position of the candle, a real image one-third the size of the candle is formed on the screen. Determine the focal length of the lens.

A lens placed between a candle and a fixed screen forms a real triply magnified image of the candle on the screen. When the lens is moved away form the candle by 0.8m without changing the position of the candle, a real image one-third the size of the candle is formed on the screen. Determine the focal length of the lens.

A lens placed between a candle and a fixed screen forms a real triply magnified image of the candle on the screen. When the lens is moved away form the candle by 0.8m without changing the position of the candle, a real image one-third the size of the candle is formed on the screen. Determine the focal length of the lens.

An object is at a distance of 1 metre from the pole of a concave mirror. Its image is found to be one-third of the size of the object. Find the position of the image, radius of curvature of the mirror and its focal length.