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19(I) What kind of lenses are used in compound microscope?
a) convex lenses b) concave lenses c) flat lenses d) none of these.
19(II) From the diagram the focal length of lenses
a) equal b) focal length of L1 is greater than L2
c) focal length of Ll is smaller than L2 d) none of these.
19(III) If the focal length of lens Ll is 20 cm. The power of lens Ll is
a) 5D b) 4D C) 0.5 D d) 0.05D
19(IV) What is the formula for magnification obtained with lens?
a) Ratio of height of image to height of object
b) Double the focal length
c) Inverse of the radius of curvature.
d) Inverse of the object distance.
19(v) Final image formed in compound microscope is
a) real b) virtual c) real and virtual d) none of these.
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