Which of the following statements are correct?
(A) In dispersion through a prism of glass, the red colour ray deviates most.
(B) In simple microscope, to get a magnified image, the object is placed within the focus of a convex lens.
(C) In compound microscope, total magnification is m = (magnification due to eye lens) × (magnification due to objective)
(D) magnifying power of telescope M= focal length of eye lens / focal length of objective lens
Choose the correct answer from the options given below:
Answer & explanation
Correct answer: option 2
The correct answer is Option (2) → (B) and (C) only
(A) In dispersion through a prism of glass, the red colour ray deviates most — ✖ False (Violet deviates most; red deviates least.)
(B) In a simple microscope, to get a magnified image, the object is placed within the focus of a convex lens — ✔ True
(C) In a compound microscope, total magnification is $m = (\text{magnification due to eye lens}) \times (\text{magnification due to objective})$ — ✔ True
(D) Magnifying power of telescope $M = \frac{\text{focal length of eye lens}}{\text{focal length of objective lens}}$ — ✖ False (Correct formula: $M = \frac{f_{\text{objective}}}{f_{\text{eyepiece}}}$)
Final Answer:
(B) and (C)