Question

In the design of telescope, concave parabolic mirror is placed ________ hyperbolic mirror.

• A. in front of
• B. behind
• C. on the same level as
• D. None of these

Answer 1

The correct option is B behind

A convex hyperbolic reflector has two foci and will reflect all light rays directed at one of its two foci towards its other focus.

A concave parabolic reflector will reflect all incoming light rays parallel to its axis of symmetry to a single point, the focus.

So, the concave parabolic mirror is placed behind the convex hyperbolic mirror.