The combination of a convex lens ( f = 18 cm ) and a thin concave lens ( f = 9 cm ) is

Assertion : In a compound microscope, the intermediate image is real, inverted and magnified. Reason : An eye specialist prescribes spectacles having a combination of convex lens (f = + 40 cm) in contact with a concave lens (f = – 25 cm). The power of this lens combination is – 1.5D

The combination of a convex lens and a concave lens each of focal length 10 cm acts like a :

An optical (eye specialist)prescibes spetacles is a pateint with a combination of a convex lens of focal length 40 cm nd concave lens 25 cm.The power of spectacles is: