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OpticsQuestion and Answers: Page 2

Question Number 41906    Answers: 0   Comments: 1

$${A}\:{concave}\:{lens}\:{of}\:{focal}\:{length}\:\mathrm{60}{cm} \\ $$$${is}\:{made}\:{of}\:{material}\:{whose} \\ $$$${refractive}\:{index}\:{for}\:{red}\:{light}\:{is} \\ $$$$\mathrm{1}.\mathrm{641}\:{and}\:{refractive}\:{index}\:{for}\:{blue} \\ $$$${light}\:{is}\:\mathrm{1}.\mathrm{659}.{That}\:{for}\:{white}\:{light} \\ $$$${is}\:\mathrm{1}.\mathrm{65}.{It}\:{is}\:{combined}\:{with}\:{a}\:{convex} \\ $$$${lens}\:{of}\:{dispersive}\:{power}\:\mathrm{0}.\mathrm{0173}\:{to} \\ $$$${form}\:{an}\:{achromatic}\:{doublet}. \\ $$$${Calculate}\:{the}\:{focal}\:{length}\:{of}\:{the} \\ $$$${achromatic}\:{lens}. \\ $$

Question Number 41753    Answers: 2   Comments: 0

$${How}\:{far}\:{must}\:{a}\:{man}\:{stand}\:{in}\:{front} \\ $$$${of}\:{a}\:{concave}\:{mirror}\:{of}\:{radius}\:\mathrm{120}{cm} \\ $$$${in}\:{order}\:{to}\:{see}\:{an}\:{erect}\:{image}\:{of} \\ $$$${his}\:{face}\:{four}\:{times}\:{its}\:{actual}\:{size}? \\ $$

Question Number 38923    Answers: 1   Comments: 0

$${A}\:{glass}\:{prism}\:{made}\:{from}\:{a}\:{material} \\ $$$${of}\:{refractive}\:{index}\:\mathrm{1}.\mathrm{55}\:{has}\:{a} \\ $$$${refracting}\:{angle}\:{of}\:\mathrm{60}°.{The}\:{prism} \\ $$$${is}\:{immersed}\:{in}\:{water}\:{of}\:{refractive} \\ $$$${index}\:\mathrm{1}.\mathrm{33}.{Determine}\:{the}\:{angle}\:{of} \\ $$$${minimum}\:{deviation}\:{for}\:{a}\:{parallel} \\ $$$${beam}\:{of}\:{light}\:{passing}\:{through}\:{the} \\ $$$${prism}. \\ $$

Question Number 38925    Answers: 1   Comments: 0

$${Calculate}\:{the}\:{deviation}\:{of}\:{a}\:{ray}\:{of} \\ $$$${light},{which}\:{is}\:{incident}\:{on}\:{a}\:{plane} \\ $$$${mirror}\:{at}\:{an}\:{angle}\:{of}\:\mathrm{40}°. \\ $$

Question Number 38235    Answers: 0   Comments: 4

$${A}\:{man}\:\mathrm{2}{m}\:\mathrm{50}{cm}\:{tall}\:{stands}\:{a} \\ $$$${distance}\:{of}\:\mathrm{3}{m}\:{in}\:{front}\:{of}\:{a}\:{large} \\ $$$${vertical}\:{plane}\:{mirror}. \\ $$$$\left.{i}\right){what}\:{is}\:{the}\:{shortest}\:{length}\:{of}\:{the} \\ $$$${mirror}\:{that}\:{will}\:{enable}\:{the}\:{man}\:{see} \\ $$$${himself}\:{fully}? \\ $$$$\left.{ii}\right){what}\:{is}\:{the}\:{answer}\:{of}\:{the}\:{above} \\ $$$${if}\:{the}\:{man}\:{were}\:\mathrm{5}{m}\:{away}? \\ $$

Question Number 37945    Answers: 0   Comments: 10

$${Two}\:{plane}\:{mirrors}\:{are}\:{inclined}\:{at} \\ $$$${an}\:{angle}\:{of}\:\mathrm{30}°.{A}\:{ray}\:{of}\:{light}\:{which} \\ $$$${makes}\:{an}\:{angle}\:{of}\:{incidence}\:{of}\:\mathrm{50}° \\ $$$${with}\:{one}\:{of}\:{the}\:{mirrors},{undergoes} \\ $$$${two}\:{successive}\:{reflections}\:{at}\:{the} \\ $$$${mirrors}.{Calculate}\:{the}\:{angle}\:{of} \\ $$$${deviation}. \\ $$$$ \\ $$$$ \\ $$$${please}\:{help}....{its}\:{urgent} \\ $$

Question Number 36068    Answers: 0   Comments: 1

$${Why}\:{is}\:{it}\:{not}\:{advisable}\:{to}\:{use} \\ $$$${small}\:{incident}\:{angle}\:{when}\:{performing} \\ $$$${experiment}\:{on}\:{refraction}\:{using}\:{a} \\ $$$${triangular}\:{prism}? \\ $$

Question Number 35876    Answers: 0   Comments: 3

$${please}\:{help} \\ $$$$ \\ $$$${why}\:{is}\:{it}\:{not}\:{advisable}\:{to}\:{use}\:{a} \\ $$$${small}\:{angle}\:{of}\:{incidence}\:{when} \\ $$$${performing}\:{experiment}\:{on}\:{refraction} \\ $$$${in}\:{a}\:{rectangular}\:{prism}???? \\ $$

Question Number 27948    Answers: 0   Comments: 0

$${what}\:{is}\:{relation}\:{between}\: \\ $$$${intensity}\:{of}\:{diffraction}\: \\ $$$${pattern}\:.{slit}\:{width}? \\ $$

Question Number 27655    Answers: 0   Comments: 0

$${what}\:{is}\:{reration}\:{betwen}\:{int} \\ $$$${ensity}\:{o}\:{diffraction}\:{and}\:{sli} \\ $$$${t}\:{witdh} \\ $$

Question Number 27751    Answers: 0   Comments: 0

$${what}\:{is}\:{relation}\:{between}\:{in} \\ $$$${tensity}\:{of}\:{diffraction}\:{anx} \\ $$$${slit}\:{width} \\ $$

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