A student focused the image of a distant object using a device X on a white screen S as shown in the figure. If the distance of the screen from the device is 30cm, select the correct statement about device X.
a) The device X is a concave mirror of focal length 15cm
b) The device X is a concave mirror of focal length 30cm
c) The device X is a concave mirror of radius of curvature 30cm
d) The device X is a convex mirror of focal length 30cm
a) The device X is a concave mirror of focal length 15cm
b) The device X is a concave mirror of focal length 30cm
c) The device X is a concave mirror of radius of curvature 30cm
d) The device X is a convex mirror of focal length 30cm
Answers & Comments
Verified answer
Answer:
Correct option is D)
As the image is focused on the screen placed behind the device X, thus device X is a lens but cannot be a mirror.
Also convex lens always forms the image of the distant object at its focus. Thus device X must be a convex lens of focal length 40 cm.
Video Explanation
Answer:
Also convex lens always forms the image of the distant object at its focus. Thus device X must be a convex lens of focal length 40 cm. Was
Explanation:
tell me do share link yes or no