When a ray of light passes through the glass slab, then the angle of incident is found to be nearly equal to angle of emergence and greater than angle of refraction.

Class 10th Science Session 2022-23 Class 10 Science Terminal Exams MCQ Solutions Class X Science MCQ Extra Questions Answers 10th Science Terminal Exam Based MCQ Extra Questions

[C] negative, positive If an image formed behind the concave mirror, the object distance is positive but if an image is formed in front of the mirror, the image distance is negative.

The white solid, lead carbonate is heated and decomposes into yellow coloured lead oxide and carbon dioxide. So, “X” is lead oxide.

Try to understand – nA = sin i/sin r = sin 45°/sin 45° = 1 nB = sin i/sin r = sin 45°/sin 45° = 1/√2 x 2/1 = √2 = 1.414