Q.The focal length of a biconvex lens is 10 cm.Find the radius of carvature.When we apply the formula R=2f,we get 20 cm,but if we apply the lens maker formula we get 10 cm(taking R.I.=1.5) .Please explain these contradictory results.Please help!!!FROMSunindra Kanghujam

An oscillator consists of a block of mass 512 g connected to a spring. When set into oscillation with amplitude 34.7 cm, it is observed to repeat its motion every 0.484 s. Find (a) the period, (b) the frequency, (c) the angular frequency, (d) the force constant, (e) the maximum speed, and ( f ) the maximum force exerted on the block.

A PLANE TRANSMISSION GRATING HAS 45000 LINES. DETERMINE ITS RESOLVING POWER IN THE SECOND ORDER FOR WAVELENGTH OF 5000A.

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What is the difference between angular position and angular fringe width... I always get confused .