Q. No.An astronomical refracting telescope will have large angular magnification and high angular resolution when it has an objective lens of:
1.
Small focal length and large diameter
2.
Large focal length and small diameter
3.
Large focal length and large diameter
4.
Small focal length and small diameter
To unlock all the explanations of 6 chapters you need to be enrolled in MasterClass Course.
To unlock all the explanations of 6 chapters you need to be enrolled in MasterClass Course.
The intensity at the maximum in a Young's double-slit experiment is \(I_0\). Distance between two slits is \(d = 5\lambda,\) where \(\lambda\) is the wavelength of light used in the experiment. What will be the intensity in front of one of the slits on the screen placed at a distance \(D = 10d\)?
1. \(\frac{I_0}{4}\)
2. \(\frac{3I_0}{4}\)
3. \(\frac{I_0}{2}\)
4. \(I_0\)
To unlock all the explanations of 6 chapters you need to be enrolled in MasterClass Course.
To unlock all the explanations of 6 chapters you need to be enrolled in MasterClass Course.
Two slits in young’s experiment have widths in the ratio 1:25. The ratio of intensity at the maxima and minima in the interference pattern is
1.
2.
3.
4.
To unlock all the explanations of 6 chapters you need to be enrolled in MasterClass Course.
To unlock all the explanations of 6 chapters you need to be enrolled in MasterClass Course.
1. \(\frac{\pi}{4}~\text{radian}\)
2. \(\frac{\pi}{2}~\text{radian}\)
3. \(\pi~\text{radian}\)
4. \(\frac{\pi}{8}~\text{radian}\)
To unlock all the explanations of 6 chapters you need to be enrolled in MasterClass Course.
To unlock all the explanations of 6 chapters you need to be enrolled in MasterClass Course.
To unlock all the explanations of 6 chapters you need to be enrolled in MasterClass Course.
To unlock all the explanations of 6 chapters you need to be enrolled in MasterClass Course.
| 1. | \(0.2~\text{mm}\) | 2. | \(0.1~\text{mm}\) |
| 3. | \(0.5~\text{mm}\) | 4. | \(0.02~\text{mm}\) |
To unlock all the explanations of 6 chapters you need to be enrolled in MasterClass Course.
To unlock all the explanations of 6 chapters you need to be enrolled in MasterClass Course.
A beam of light of λ = 600 nm from a distant source falls on a single slit 1 mm wide and the resulting diffraction pattern is observed on a screen 2 m away. The distance between the first dark fringes on either side of the central bright fringe is :
1. 1.2 cm
2. 1.2 mm
3. 2.4 cm
4. 2.4 mm
To unlock all the explanations of 6 chapters you need to be enrolled in MasterClass Course.
To unlock all the explanations of 6 chapters you need to be enrolled in MasterClass Course.
In Young's double-slit experiment, the intensity of light at a point on the screen where the path difference is \(\lambda\) is \(K\), (\(\lambda\) being the wavelength of light used). The intensity at a point where the path difference is \(\frac{\lambda}{4}\) will be:
1. \(K\)
2. \(\frac{K}{4}\)
3. \(\frac{K}{2}\)
4. zero
To unlock all the explanations of 6 chapters you need to be enrolled in MasterClass Course.
To unlock all the explanations of 6 chapters you need to be enrolled in MasterClass Course.
2. 4 mm
3. 3 mm
4. 8 mm
To unlock all the explanations of 6 chapters you need to be enrolled in MasterClass Course.
To unlock all the explanations of 6 chapters you need to be enrolled in MasterClass Course.
A parallel beam of fast-moving electrons is incident normally on a narrow slit. A fluorescent screen is placed at a large distance from the slit. If the speed of the electrons is increased, which of the following statements is correct?
| 1. | The angular width of the central maximum of the diffraction pattern will increase. |
| 2. | The angular width of the central maximum will decrease. |
| 3. | The angular width of the central maximum will be unaffected. |
| 4. | A diffraction pattern is not observed on the screen in the case of electrons. |
To unlock all the explanations of 6 chapters you need to be enrolled in MasterClass Course.
To unlock all the explanations of 6 chapters you need to be enrolled in MasterClass Course.
© 2025 GoodEd Technologies Pvt. Ltd.