Refractive index
Refractive index is a Science & Technology concept from the MPSC syllabus, tested in 4 past MPSC questions (2015, 2017, 2021). Below are those real questions with their correct answers and explanations, plus the concepts worth being comfortable with first.
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ज्याच्या प्रत्येक पृष्ठभागाची वक्रता त्रिज्या 50 सेमी आहे, अशा डबल बहिर्वक्र भिंगाचे नाभीय अंतर किती असेल, जर काचेचा वकीभवन दर्शक 1.50 असेल ? What is the focal length of a double convex lens for which the radius of curvature of each surface is 50 cm and the refractive index of glass is 1.50 ?
Using the lens maker's formula 1/f = (n - 1)(1/R1 - 1/R2), with n = 1.50 and R1 = 50 cm, R2 = -50 cm, the focal length calculates to 50 cm.
प्रकाशाचा वेग ____________ असतो. Speed of light is ____________.
The speed of light in a vacuum is a fundamental physical constant, approximately equal to 3 × 10⁸ meters per second.
जर प्रकाश पहिल्या माध्यमातून 2 × 10⁸ ms⁻¹ वेगाने जाताना दुसऱ्या माध्यमात त्याचा वेग 1.25 × 10⁸ ms⁻¹ होत असेल तर दुसऱ्या माध्यमाचा पहिल्या माध्यमाच्या संदर्भातील अपवर्तनांक काढा. Find the refractive index of the second medium with respect to the first medium, if light moves through the first medium with velocity 2 × 10⁸ ms⁻¹, which changes to 1.25 × 10⁸ ms⁻¹ in the second medium.
Refractive index of second medium with respect to first medium is given by the ratio of speed of light in the first medium to that in the second medium: (2 × 10⁸) / (1.25 × 10⁸) = 1.6.
अतिनील किरणे _________ मधून आरपार जाऊ शकत नाहीत.
(a)कांच
(b)क्वार्ट्झ
(c)फ्लूओराईट
(d)रॉक सॉल्ट (सैंधव)
Ordinary glass absorbs ultraviolet (UV) rays and does not allow them to pass through. Quartz, fluorite, and rock salt are transparent to UV rays.