Question

The figure show three light rays A, B, C incident on the
region reflects these the optical object placed in the region
and complete this ray diagram.
A B C
A-
В.
С
S
R
Fig. 6.15​

Answer 1

Explanation:

Correct option is D)

Gram atomic mass = mass of 1 mole atoms× mass of one atom 

=(6.022×1023)×(6.664×10−23)=40.01gm

Gram atoms=moles=mass/molarmass=40000/40=1000

∴  The number of gram atoms in 40kg = 1000

Hence, the correct option is C