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By properly combining two prisms made of...

By properly combining two prisms made of different materials, it is possible

A

a.have dispersion without average deviation

B

b.have deviation without dispersion

C

c.have both dispersion and average deviation

D

d.have neither dispersion nor average deviation.

Text Solution

AI Generated Solution

The correct Answer is:
To solve the question, we need to analyze the behavior of light when it passes through two prisms made of different materials. We will evaluate the four options given in the question regarding dispersion and average deviation. ### Step-by-Step Solution: 1. **Understanding Dispersion and Deviation**: - Dispersion occurs when white light passes through a prism and splits into its constituent colors (spectrum). - Deviation refers to the bending of light as it passes through the prism, which is influenced by the refractive index of the material. 2. **Combining Two Prisms**: - We can combine two prisms made of different materials. Let’s denote the first prism as Prism A and the second prism as Prism B. - The refractive indices of the two prisms can be different, and we can analyze their effects. 3. **Option A: Dispersion without Average Deviation**: - If the two prisms have opposite refractive indices, they can cause dispersion (splitting of light into colors) while the net deviation can be zero. This means that the light emerges parallel to the incident ray. - Therefore, this option is **correct**. 4. **Option B: Deviation without Dispersion**: - It is possible for light to pass through a prism and experience deviation without dispersion. For example, if the light is monochromatic, it will deviate but will not split into colors. - Thus, this option is also **correct**. 5. **Option C: Both Dispersion and Average Deviation**: - If the prisms do not have opposite refractive indices, both dispersion and deviation can occur. The light will split into colors and also deviate from its original path. - Hence, this option is **correct** as well. 6. **Option D: Neither Dispersion nor Average Deviation**: - When light enters a prism, it will always experience some degree of deviation due to the change in medium, regardless of whether it disperses or not. - Therefore, this option is **incorrect**. ### Conclusion: From the analysis, we conclude that: - Options A, B, and C are correct. - Option D is incorrect. ### Final Answer: - **Correct Options**: A, B, C - **Incorrect Option**: D
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