Which of the following is used as a primary mirror in a Newtonian telescope?

(A) Plane mirror
(B) Concave mirror
(C) Convex mirror
(D) Eyepiece [1 Mark]

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Solution

From the above image of the Newtonian telescope's ray diagram, we can see the light ray first strikes the primary mirror which here is a concave mirror. The secondary mirror in case of the Newtonian telescope is a plane mirror.

Hence option B is correct.

[1 Mark]

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Q. Out of plane mirror, convex mirror and concave mirror:
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Q. Which of the following is used as a primary mirror in a Newtonian telescope?

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Which of the following is used as a primary mirror in a Newtonian telescope? (A) Plane mirror (B) Concave mirror (C) Convex mirror (D) Eyepiece [1 Mark]

From the above image of the Newtonian telescope's ray diagram, we can see the light ray first strikes the primary mirror which here is a concave mirror. The secondary mirror in case of the Newtonian telescope is a plane mirror. Hence option B is correct. [1 Mark]

Which of the following is used as a primary mirror in a Newtonian telescope?

(A) Plane mirror
(B) Concave mirror
(C) Convex mirror
(D) Eyepiece [1 Mark]

From the above image of the Newtonian telescope's ray diagram, we can see the light ray first strikes the primary mirror which here is a concave mirror. The secondary mirror in case of the Newtonian telescope is a plane mirror.

Hence option B is correct.

[1 Mark]