In astronomical telescope, if the rays subtend an angle A at the lens, the image formed by the objective is not at the focus but slightly behind. Still in the derivation , it is apprboximated to be focus. What if the angle subtended needs to be considered

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In astronomical telescope, if the rays subtend an angle A at the lens, the image formed by the objective is not at the focus but slightly behind. Still in the derivation , it is apprboximated to be focus. What if the angle subtended needs to be considered

In astronomical telescope, if the rays subtend an angle A at the lens, the image formed by the objective is not at the focus but slightly behind. Still in the derivation , it is apprboximated to be focus.
What if the angle subtended needs to be considered

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In astronomical telescope, if the rays subtend an angle A at the lens, the image formed by the objective is not at the focus but slightly behind. Still in the derivation , it is apprboximated to be focus. What if the angle subtended needs to be considered

In astronomical telescope, if the rays subtend an angle A at the lens, the image formed by the objective is not at the focus but slightly behind. Still in the derivation , it is apprboximated to be focus.What if the angle subtended needs to be considered

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In astronomical telescope, if the rays subtend an angle A at the lens, the image formed by the objective is not at the focus but slightly behind. Still in the derivation , it is apprboximated to be focus.
What if the angle subtended needs to be considered