MCQ
Astigmatism (for a human eye) can be removed by using
- AConcave lens
- BConvex lens
- ✓Cylindrical lens
- DPrismatic lens
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$(A)$ The ratio of the longest wavelength to the shortest wavelength in Balmer series is $9 / 5$
$(B)$ There is an overlap between the wavelength ranges of Balmer and Paschen series.
$(C)$ The wavelengths of Lyman series are given by $\left(1+\frac{1}{ m ^2}\right) \lambda_0$, where $\lambda_0$ is the shortest wavelength of Lyman series and $m$ is an integer
$(D)$ The wavelength ranges of Lyman and Balmer series do not overlap


