Question

A lens X has following observation a. When the objects is placed at infinity, the image is formed at focus of the lens b. When a object is placed at 60 cm from the lens, A real image is forced at 10 cm from lens on other side c. The lens has positive Power Answer following based on the data given above 1. The lens is a. Convex b. Concave 2. The focal length of the lens is a. 20 cm b. 10 cm c. 25 cm d. None of these 3. The power of the lens a. 10 D b. 5 D c. 4 D d. None of these 4. When the object is placed at a distance twice the focal length in front of lens, what will be characteristics of the image formed a. A real inverted image of same size will be formed at a distance twice the focal length b. A real ,erect image of high diminished size will be formed at a distance twice the focal length c. A high enlarged image at infinity will be formed d. None of these 5. When the lens is placed close to the page of book, the letters of the page appear a. Highly diminished b. Enlarged c. Same size as object d. None of these​

Answer 1

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