Chapter 16: Problem 2256
An observer look at a tree of height 10 meters away with a telescope of magnifying power \(10 .\) To him, the tree appears (A) 10 times taller (B) 10 times smaller (C) 10 times nearer (D) 20 times nearer
Chapter 16: Problem 2256
An observer look at a tree of height 10 meters away with a telescope of magnifying power \(10 .\) To him, the tree appears (A) 10 times taller (B) 10 times smaller (C) 10 times nearer (D) 20 times nearer
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Get started for freeIn a thin prism of glass \(\left(a_{(n) g}=1.5\right)\) which of the following relation between the angle of minimum deviation \(\delta_{\mathrm{m}}\) and the angle of refraction \(\mathrm{r}\) will be correct? (A) \(\delta_{\mathrm{m}}=(\mathrm{r} / 2)\) (B) \(\left(\delta_{\mathrm{m}} / 2\right)=\mathrm{r}\) (C) \(\delta_{\mathrm{m}}=1.5 \mathrm{r}\) (D) \(\delta_{\mathrm{m}}=\mathrm{r}\)
A Sound wave travels from air to water. The angle of incidence is \(\alpha_{1}\) and the angle of reflection is \(\alpha_{2}\) If the snell's Law is valid then, (A) \(\alpha_{1} \geq \alpha_{2}\) (B) \(\alpha_{1}=\alpha_{2}\) (C) \(\alpha_{1}>\alpha_{2}\) (D) \(\alpha_{1}<\alpha_{2}\)
Light of certain color contain 2000 waves in the length of \(1 \mathrm{~mm}\) in air. What will be the wavelength of this light in medium of refractive index \(1.25\) ? (A) \(1000 \AA\) (B) \(2000 \AA\) (C) \(3000 \AA\) (D) \(4000 \AA\)
To get five images of a single object one should have two plane mirrors at an angle of (A) \(36^{\circ}\) (B) \(72^{\circ}\) (C) \(80^{\circ}\) (D) \(302^{\circ}\)
The fringe width for red $\beta_{\mathrm{r}}\left(\lambda_{\mathrm{T}}=8000 \AA\right.$ ) and the fringe width for violet \(\beta_{\mathrm{v}}\left(\lambda_{\mathrm{v}}=4000 \AA\right.\) ) then \(\left(\beta_{\mathrm{r}} / \beta_{\mathrm{v}}\right)=\) (A) \(2: 1\) (B) \(1: 2\) (C) \(1: 1\) (D) \(\sqrt{2}: 1\)
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