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

A spherical concave mirror of focal length 10 cm and a double convex lens of focal length 5 cm are arranged on the common principal axis as shown in the figure. A small object is placed on the principal axis between the focal points $F_1$ and $F_2$ of the mirror and the lens, respectively. If two real and mutually inverted images are formed by the lens at the same location on the principal axis, what is the distance of the object from the mirror on the principal axis?

10 cm की फोकल दूरी वाला एक अवतल गोलीय दर्पण एवं 5 cm की फोकल दूरी वाला एक उभयोत्तल लेन्स अपने पारस्परिक मुख्य अक्ष पर चित्र में दर्शाये व्यवस्था के अनुसार संयोजित हैं। इस मुख्य अक्ष पर किसी बिम्ब को दर्पण एवं लेन्स के फोकस बिन्दुओं, क्रमशः \(F_1\) और \(F_2\) के बीच रखा गया है। यदि इस स्थिति में लेन्स के द्वारा दो वास्तविक एवं परस्पर उल्टे प्रतिबिम्ब मुख्य अक्ष के एक ही बिन्दु पर बनते हैं तो बिम्ब की दर्पण से दूरी कितनी होगी?

A charged particle is moving in a circular orbit with radius $r$ and orbital angular frequency $\omega$ in the presence of a magnetic field. The orbit is enclosed within a larger circular metallic frame. The frame is concentric and coplanar with the orbit. The radius of the frame is now gradually decreased. Assuming that the particle remains within the frame at all times, what changes to the trajectory of the particle will occur as the frame is being shrunk?

The refractive indices (\(n\)) of two transparent slabs are \(2\) and \(2/\sqrt{3}\). They are attached together and placed in a third transparent medium of refractive index \(\sqrt{2}\), as shown in the figure. The thickness of the upper slab is \(1\ \text{cm}\). A monochromatic light ray is incident on the upper slab at \(45^\circ\). What would be the thickness in \(\text{cm}\) of the lower slab such that the lateral shift of the ray after passing through both the slabs is zero?