An object is placed in front of a convex lens of focal length . At what distance from the lens (in cm) is the image formed?
Answer and explanation
Correct answer: C. 40/3
- Step 1: State the thin lens formula using Cartesian sign convention: .
- Step 2: Substitute focal length and real object distance : .
- Step 3: Solve for image distance: .
Answer
40/3.
Why not the others: The other values (8, 50, 70/3) stem from violating Cartesian sign conventions for focal length and object distance, or adding reciprocals incorrectly.
Practise more Ray optics.
Free questions with an explanation for every one, and full timed CBSE Class 12 mock tests.
More Ray optics questions
- An object is placed in front of a convex lens of focal length . At what distance from the lens (in cm) is the…
- An object is placed in front of a convex lens of focal length . At what distance from the lens (in cm) is the…
- An object is placed in front of a convex lens of focal length . At what distance from the lens (in cm) is the…
- An object is placed in front of a convex lens of focal length . At what distance from the lens (in cm) is the…
- An object is placed in front of a convex lens of focal length . At what distance from the lens (in cm) is the…
- An object is placed in front of a convex lens of focal length . At what distance from the lens (in cm) is the…