A convex lens of focal length 30 cm forms an image 45 cm from the lens .How far is the object placed from the lens .Nature and Ray diagram
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Explanation:
A concave lens always forms a virtual, erect image on the same side of the object.
Image-distance v = –45 cm;
Focal length f = –30cm;
Object-distance u = ?
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Answer:
(a) The focus of a divergent i.e. concave lens is the point on the principal axis from which the light rays parallel to the axis is diverged after passing through the lens. The distance between the pole of the concave lens and principal focus is called Focal length.
(b) Given: Focal length, f = -30 cm
Size of the object, h1 = 6 cm
Image distance, v = -15 cm
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