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In order to determine the focal length o...

In order to determine the focal length of a concave mirror by obtaining the image of distant object on screen, the position of screen should be

A

parallel to plane of concave mirror

B

perpendicular to plane of concave mirror

C

inclined at an angle `60^@` to plane of mirror

D

in any direction with respect to the plane of concave mirror

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To determine the focal length of a concave mirror by obtaining the image of a distant object on a screen, follow these steps: ### Step-by-Step Solution: 1. **Understand the Setup**: - You have a concave mirror and a distant object. The focal point of the concave mirror is where the light rays converge after reflecting off the mirror. 2. **Position of the Object**: - Since the object is distant, we can consider it to be at infinity. This means that the light rays coming from the object are essentially parallel when they reach the mirror. 3. **Reflection of Light Rays**: - When parallel light rays strike the concave mirror, they reflect and converge at the focal point of the mirror. 4. **Positioning the Screen**: - To capture the image formed by the concave mirror, the screen must be positioned such that it is perpendicular to the principal axis of the mirror. This is because the image formed by the mirror will also be perpendicular to the principal axis. 5. **Conclusion**: - Therefore, the position of the screen should be perpendicular to the principal axis of the concave mirror to obtain a clear and sharp image of the distant object. ### Final Answer: The position of the screen should be **perpendicular to the principal axis** of the concave mirror. ---
To determine the focal length of a concave mirror by obtaining the image of a distant object on a screen, follow these steps: ### Step-by-Step Solution: 1. **Understand the Setup**: - You have a concave mirror and a distant object. The focal point of the concave mirror is where the light rays converge after reflecting off the mirror. 2. **Position of the Object**: ...
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