Important Questions SHORT ANSWER TYPE QUESTIONS [II] [3 Marks] – Year 2007 1. A concave lens has focal length of 20 cm. At what distance from the lens a 5 cm tall object be placed so that it forms an image at 15 cm from the lens? Also calculate the size of the image formed. [Delhi] Answer. 2. An object 50 cm tall is placed on the principal axis of a convex lens. Its 20 cm tall image is formed on the screen placed at a distance of 10 cm from the lens. Calculate the focal length of the lens. [All India] Answer. CBSE Class 10 Science – More Resources NCERT Solutions for Class 10 Science NCERT Exemplar Class 10 Science CBSE Class 10 Previous Year Question Papers Class 10 Science Important Questions LONG ANSWER TYPE QUESTION [5 Marks] – Year 2007 3. Draw the ray diagram in each case to show the position and nature of the image formed when the object is placed: (i) at the centre of curvature of a concave mirror (ii) between the pole P and focus F of a concave mirror (iii) in front of a c