List of top Physics Questions on Ray optics and optical instruments asked in JCECE

A ray PQ incident on the refracting face BA is refracted in the prism BA C as shown in the figure and emerges from the other refracting face AC as RS, such that AQ = AR. If the angle of prism $A = 60^\circ$ and the refractive index of the material of prism is $\sqrt 3,$ then the angle of deviation of the ray is

A thin lens made of glass of refractive index $\mu = 1.5$ has a focal length equal to 12 cm in air. lt is now immersed in water $\bigg(\mu = \frac{4}{3}\bigg).$ Its new focal length is

A beam of monochromatic blue light of wavelength $4200\, ?? in air travels in water of refractive index $4/3$. Its wavelength in water will be:

The twinkling effect of star light is due to

A person sees clearly at a distance of 100 cm, then power of lens used to see object at 40 cm is