The concave mirror is used to form an image of a very distant object. A light so

Question

The concave mirror is used to form an image of a very distant object. A light source in a dark room is 40 cm from the concave mirror and illuminated at the concave mirror slightly tilted to the right and a large image on a card is formed 2 meters from the mirror. This distance can give a good estimate of the focal length of the mirror. Why is this so?

The optical device in the image shown above is supposed to be a concave mirror.

Explanation / Answer

let the concave mirro have a focal length f

now, tyhe illuminatedx object in the room has light rays coming from it in such a way that these are parallel to each other
this means, even though the object is at a finite location, since the rays coiming from it are firly parallel, the light rays will collect on the focus after reflection

hence the image distacne in this case gives us a fir approximation of the focal length of the concave mirror

Related Questions

Navigate

• Browse (All)
• Browse T
• Subjects

Integrity-first tutoring: explanations and feedback only — we do not complete graded work. Learn more.