A convex lens has a focal length of 20 cm. It is used to form an image of an object placed 15 cm from lens. The image is

A convex lens of focal length 15 cm is placed on a plane mirror. An object is placed 20 cm from the lens. The image is formed

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 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 convex lens has a focal length of 25 cm. Calculate the distance of the object from the lens if the image is to be formed on the opposite side of the lens at a distance of 75 cm from the lens. What will be nature of image ?

A convex lens of focal length 20cm is placed 10cm away from a second convex lens of focal length 25 cm. What wil be the location of the image of an object at 30 cm in front of the first lens?

A convex lens of focal length 20cm is placed 10cm away from a second convex lens of focal length 25 cm. What wil be the location of the image of an object at 30 cm in front of the first lens?

A convex lens has a focal length 15 cm. A student obtains a clear sharp image of an object by placing it at 20 cm distance from the lens. At what distance approximately will he obtain an image of magnification - l ?

A concave lens has focal lengths of 20 cm. At what distance from the lens a 5cm tall object be placed so that it forms an image at 15 cm from the lens ? Also calculate the size of the image formed.