Aspherical surface of radius 30cm separates 2 transperent media  A & B with refractive indices 1.33 & 1.48 resply  d  medium is on  d convex surface where should a point  object  b placed in a medium A so dat d peraxial rays bcome parallel after refraction at d surface ?

 

1end of a cylindrical glass rod  =1.5  of radius 1cm is rounded in d shape of a hemi sphere d rod is immeresed in water =4/3 & an object is placed in water along d axis of rod  at a distance of 8cm 4m d rounded edge locate d image of d object

 

A convex has a focal length of 10cm find d location & nature of d image if point object is placed on d principal axis at a distance of

 

a) 9.8 cm

b) 10.2 cm 4m d lens