Ray optics
a lens of power + 2 dioptres is placed in contact with a lens of power - 1 dioptre. The combination will behave like
A convergent lens of focal length 100 cm.
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A convex lens is at a distance of 10 cm from a convex mirror of focal length 10 cm as shown in figure. A beam of light parallel to the principal axis is incident on the tens. After refraction through the lens, reflection at the mirror and again refraction through the lens, the final emergent beam refraces the path of the incident beam then focal length of the lens is
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