object is placed at a distance of 10 cm from a co-axial combination of two lenses A and B in contact. The combination forms a real image three times the size of the object. If lens B is concave with a focal length of 30 cm , then the nature and focal length of lens A is
Text Solution
Verified by ExpertsThe correct answer is:
C
Magnification, 
Focal length of co-axial combination,
Hence, lens A is convex lens.
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.
Similar Questions
Explore conceptually related problems
Light falls on a plane reflecting surface. For what angle of incidence is the reflected ray normal …
A plane mirror reflects a pencil of light to form a real image, then the pencil of light incident o…
A man is 180 cm tall and his eyes are 10 cm below the top of his head. In order to see this entire …
To get three images of a single object, one should have two plane mirrors at an angle of
An object (O) is placed between two parallel plane mirrors as shown in figure. Distance between 4th…
A concave mirror of focal length f (in air) is immersed in water . The focal length of the mirror …