A convex lens forms a real image of an object with magnific…

Physics Ray Optics Mix MCQ (Single Correct)

A convex lens forms a real image of an object with magnification 0.5. If the object displaced by 20 cm along the principal axis, a real image equal to the size of the object is formed -

The focal length of lens is 20 cm

The distance of the image from the lens initially is 25 cm

The distance of the object from the lens initially is 60 cm

The distance of the image finally from the lens is 30 cm

Text Solution

Verified by Experts

The correct answer is:

CHECK THE SOLUTION.

(a, c)

Magnification of lens m = .

If initially magnification in magnitude is 0.5 then object must be beyond 2f because size of image is smaller. After shifting through 20 cm, the final image is of same size as that of object. So finally object is at focus

2f = 40 cm ⇒ f = 20 cm

Prepare Smarter with CGP Edu

Get practice questions, solutions, and test series in one place.

Write a Review

Share your experience with this question and solution.

Commentary

Send your comment, doubt, correction, or feedback to admin.

Student Reviews

What students say about this solution

No reviews yet. Be the first to write a review.

Share this question

Text Solution

Prepare Smarter with CGP Edu

Write a Review

Commentary

Student Reviews

Similar Questions