A rectangular block of wood of dimensions 40cm x 20cm x 10cm is kept on a table top. The pressure is greatest when it is rested on
40cm x 20cm
40cm x 10cm
20cm x 10 cm
equal for all cases
Pressure = force / area
For greatest pressure area must be Least.
If AB = 10 cm & DB = 40 cm (diameter). What is the radius of curvature & focal length?
If AB = 10 cm & DB = 40 cm (diameter)
What is radius of curvature & focal length?
The radius of curvature of a spherical mirror is 20 cm. What is its focal length?