Question

Lower half of a convex lens is made opaque. Which of the following describes the image of the object placed in front of the lens?(A) No change in image
(B) Image will show only half of the object
(C) Intensity of image gets reduced
Choose the correct answer from the options given below.

• A. (A) only
• B. (B) only
• C. (B )(C) only
• D. (C) only

Answer 1

The Correct Option is D

The scenario concerns a convex lens where its lower half is rendered opaque. The objective is to determine the consequence on the image of an object placed before the lens.

Let's evaluate each provided option:

1. Image remains unchanged: Light traversing any segment of a lens contributes to the formation of the complete image. Consequently, even with half the lens obscured, the full image is still generated, albeit with diminished brightness. This option is therefore incorrect.
2. Image displays only a portion of the object: As the lens continues to focus light from all sections of the object, the entire image is formed, but with reduced intensity. Hence, the statement that only half the object is visible is erroneous.
3. Image intensity is reduced: Obscuring half the lens undeniably limits the quantity of light that can pass through to form the image. This leads to an image exhibiting reduced intensity. This option is consistent with established physical principles.

Following this analysis, the correct conclusion is: (C) Intensity of image gets reduced