One half of a convex lens of focal length 10 cm is covered with a black paper. Can such a lens produce an image of a complete object placed at a distance of 30 cm from the lens? Draw a ray diagram to justify your answer. A 4 cm tall object is placed...

(a) Define absolute refractive index. (b) The path of a light ray from three different media A, B and C for a given angle of incidence is shown below. Study the diagrams and answer the following questions:(i) Which of the three media A, B or C...

State the relation between object distance, image distance and focal length of a concave or convex mirror. A concave mirror produces two times magnified real image of an object at 10 cm from it. Find the position of the image.

(a) Write relation between , u v f for lenses and for mirrors, where , uvf are object distance, image distance and focal length respectively. (b) The magnification produced by a concave mirror is m 4 =+. Write the information about the image given...

The focal length of a concave mirror is 30 cm. Find the position of the object in front of the mirror so that the image is three times the size of the object.

A 5 cm tall object is placed perpendicular to the principal axis of a convex lens of focal length 20 cm. The distance of the object from the lens is 30 cm. Find the a. position b. nature c. size of the image formed.

An object 4 cm high is placed at a distance of 27 cm in front of a convex lens of focal length 18 cm. Find the position, nature and size of the image formed. 

An object 5 cm high is kept 25 cm away from a converging lens (convex lens) of focal length 10 cm. What is nature, position and the size of the image?

An object is placed 15 cm from a convex mirror of radius of curvature 60 cm. Find the position of image and its magnification.

A point object is placed at a distance of 12 cm from a convex lens on its principal axis. Its image is formed on the other side of the lens at a distance of 18 cm from the lens. Find the focal length of the lens. Is the image magnified? Justify your...