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Sahay Sir > Question Answers > NCERT Exemplar Class 12 > Physics > Chapter 9 - Ray Optics and Optical Instruments > A circular disc of radius ‘R’ is placed co-axially and horizontally inside and opaque hemispherical bowl of radius ‘a’, Fig. The far edge of the disc is just visible when viewed from the edge of the bowl. The bowl is filled with transparent liquid of refractive index μ and the near edge of the disc becomes just visible. How far below the top of the bowl is the disc placed ?

A circular disc of radius ‘R’ is placed co-axially and horizontally inside and opaque hemispherical bowl of radius ‘a’, Fig. The far edge of the disc is just visible when viewed from the edge of the bowl. The bowl is filled with transparent liquid of refractive index μ and the near edge of the disc becomes just visible. How far below the top of the bowl is the disc placed ?

A circular disc of radius 'R' is placed co-axially and horizontally inside and opaque hemispherical bowl of radius 'a' same or less than that for blue light ? Will the focal length of a lens for red light be more