5.) A converging lens produces an image four times as large as an object placed...

5.) A converging lens produces an image four times as large as an object placed 25cm from the lens. Calculate its focal length
9.) A converging lens of focal length 15cm forms a virtual image at a point 10cm from the lens. Calculate the distance of the object from the lens.
18b.) the objective and the eyepiece of an astronomical telescope have focal lengths of 50cm and 5cm respectively. What is the distance apart of the lenses if:
i. Object and final image are both at infinity
ii. The object is at infinity and the final image is formed 25cm from the eye lens?

In Physics
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Asked by ayo on 15th July, 2020