Home › NEET UG › Physics › Ray Optics and Optical Instruments › For a prism, the angle of deviation D is related…
For a prism, the angle of deviation D is related to the angle of prism A and refractive index n by (at minimum deviation):
An = (D + A)/A
Bn = sin((A + D_m)/2) / sin(A/2) — the prism formula
Cn = D × A
Dn = cos(A) × sin(D)
Answer & Solution
Correct answer: B. n = sin((A + D_m)/2) / sin(A/2) — the prism formula
**Prism formula at minimum deviation**: n = sin((A + D_m)/2) / sin(A/2). Used to determine refractive index of the prism material experimentally. At minimum deviation, the ray passes symmetrically through the prism (i₁ = i₂; the refracted ray inside is parallel to the base).
Related questions
A reflecting telescope of the folded design is named after:A mirror used as a telescope objective is free from aberration that is:A telescope provides angular magnification of objects that are:The objective of a compound microscope forms an image that is:In a compound microscope, the lens nearest the object is the:For much larger magnification, one uses lenses numbering:The maximum magnification of a simple microscope is described as:The near point of the eye is taken as a distance of about: