Related InterviewSolutions

• A concave mirror of focal length 20 cm is to be used as a shaving mirror. Which of the following is the suitable object distance from the mirror ? (i)10 cm (ii)20 cm (iii) 30 cm.
• A concave mirror is used as a head mirror by ENT specialists. The same mirror can also be used as a shaving mirror. Why?
• (a) State the relation between object distance, image at a distance of 30 cm from the mirror when the object is Give the New Cartesian Sign Conventions used. (b) A concave mirror forms a virtual and erect image at a distance of 30 cm from the mirror when the object is held at 10 cm in front of the mirror. Calculate focal length of the mirror.
• Can a concave mirror form a virtual image of same size as the object?
• What is the basic difference between a concave mirror and a convex mirror?
• For what position of an object, a concave mirror forms a real image equal in size to the object?
• A student has to project a three times magnified image of a candle flame on a wall. Name the type of the lens (converging/diversing) required for the purpose. If the candle flame is at a distance of 6 m from the wall, find the focal length of the lens.
• A converging mirror forms a real image of height 4 cm, of an object of height 1 cm placed 20 cm away from the mirror. Calculate the image distance. What is the focal length of the mirror ?
• A thin lens has a focal length of `- 25 cm`. What is the power of the lens? It is convex or concave ?
• Study the given ray diagrams and select the correct statement from the following : A. Device X is a concave mirror and device Y is a convex lens, whose focal lengths are `20 cm` and `25 cm` respectively.B. Device X is a convex lens and device Y is a concave mirror, whose focal lengths are `10 cm` and `25 cm` respectively.C. Device X is a concave lens and device Y is a convex mirror, whose focal lengths are `20 cm` and `25 cm` respectively.D. Device X is a convex lens and device Y is a concave mirror, whose focal lengths are `20 cm` and `25 cm` respectively.